S3, E91 - All About Oil

Right to repair is a policy and advocacy effort aimed at ensuring vehicle owners and independent shops can access the tools, parts, and information needed to service modern vehicles. The host mentions it as part of promoting the automotive aftermarket.

The automotive aftermarket is the market for parts and services sold outside of a vehicle’s original manufacturer. This episode frames the host’s advocacy as supporting aftermarket options for trucks and their owners.

Amsoil is an automotive lubricant brand best known for its synthetic oils and related products. In this episode, the hosts bring Amsoil representatives on to discuss how to pick the right oil for trucks based on viscosity and quality.

Oil viscosity is a measure of how thick or thin an oil is, and it strongly affects how well the oil flows and protects the engine. Choosing the correct viscosity helps ensure proper lubrication across different temperatures and operating conditions.

Synthetic oils are engineered lubricants designed to provide more consistent performance than conventional oils, especially across temperature extremes. The episode frames Amsoil as a synthetic-oil provider and ties it to protection for truck engines and components.

Diesel is a fuel type used in many trucks, known for high energy density and torque-focused operation. Oil choice can differ for diesel engines because of their operating conditions and emissions-related systems.

Electricity is referenced here as an energy source for trucks, implying a discussion that may include how lubrication needs differ from internal-combustion vehicles. The episode’s oil focus suggests the conversation will contrast oil use across powertrains.

In this context, “overhead” means extra protective margin—oil performance headroom beyond normal operating conditions. The host uses it to argue that certain oils can better handle heavy-duty use or abuse by maintaining lubrication.

Lubricity is how well a lubricant reduces friction between moving parts. The transcript groups lubricity with protection as a key benefit of certain oils and additive packages.

“Winter weight” refers to the cold-weather portion of an oil’s viscosity grade (the number before the “W”). It describes how the oil behaves at low temperatures so the engine can lubricate quickly at startup.

The “W” in an oil grade (like 0W-40) stands for winter, and the number before it indicates how the oil flows in cold temperatures. That cold-flow behavior matters for startup lubrication and reducing wear during warm-up.

“Mopar lifters” refers to valve lifters used in Chrysler/Dodge/Jeep (Mopar) engines, discussed here as part of a failure pattern. The episode links the lifter tick symptom to a subsequent lifter collapse event.

Hemi lifter collapse refers to a failure mode where the hydraulic valve lifters lose their ability to maintain proper pressure, which can lead to valve train problems. The discussion ties it to oil viscosity/weight because oil that’s too thin (or not behaving as expected under heat) can contribute to inadequate lifter operation.

Oil weight (like “40 weight” or “20 weight”) is the viscosity grade used in engine oil labeling. It indicates how the oil behaves at operating temperatures, and changing weight can be part of recall or service guidance when certain engines show wear or lifter/valvetrain issues.

“40 weight” refers to an SAE viscosity grade (commonly written as 40 in oil labeling) that indicates the oil’s thickness at operating temperature. The host mentions it in the context of engines that were directed to use a higher-viscosity oil as part of a recall-related fix.

“020” is shorthand in the discussion for a low-viscosity oil grade (commonly associated with 0W-20). The host contrasts it with the “bump up” to a higher weight, implying that oil grade/viscosity can influence the engine issues being discussed.

0W-20 is an engine-oil viscosity grade. The “0W” indicates it flows very well when cold, and “20” indicates its thickness when hot, which affects friction and fuel economy.

Engine-oil additives are chemical packages blended into base oil to improve specific properties like detergency, anti-wear protection, and corrosion resistance. The key point in the segment is that many additives are already included in higher-priced oils, while “add-on” additives may be redundant or ineffective.

Phosphorus is an element used in some oil additive chemistries (often related to anti-wear performance). In the segment, the claim is that excessive phosphorus can burn off and contribute to exhaust deposits, so it may not deliver the benefit people expect.

“Lifter tick” is a common noise associated with hydraulic valve lifters when they don’t get oil pressure/flow quickly enough or when oil quality/viscosity isn’t ideal. The segment argues that some additives may temporarily reduce the noise, but it can return after the oil/additive effect wears off.

R&D in engine-oil formulation refers to testing and engineering work used to design oil chemistry for specific engine requirements. In this segment, the hosts connect R&D to matching oil performance to tighter bearing tolerances in newer engines.

A synthetic blend is an engine oil made from a mixture of synthetic oil and conventional (mineral) oil. The “synthetic” portion is often much smaller than marketing implies, so performance can be closer to conventional oil unless the formulation is strong.

Base oil is the main liquid component of an engine oil—typically the majority of the total formulation. Additives are blended into the base oil to provide specific properties like wear protection and detergency.

A crank position sensor monitors the crankshaft’s position and speed so the engine control unit can time fuel injection and ignition. The transcript describes it as detecting variance that may correlate with vibration or other running issues.

“0W” is the winter (cold-weather) viscosity rating in an engine oil’s SAE grade. A lower “W” number indicates the oil should flow and crank more easily at colder temperatures, improving cold starts.

The “J 300” standard is an industry test/qualification standard that defines how engine oils are classified by viscosity and performance requirements. The discussion implies that oils with the same viscosity grade must meet the same baseline cold-start and flow behavior targets.

The “cold crank” number is a measure related to how easily the engine can be cranked (spun by the starter) at low temperatures. In practice, it’s used to compare low-temperature starting performance between oils of the same grade.

Kinematic viscosity is a lab-measured property that describes an oil’s resistance to flow at a specific temperature. The transcript ties it to the “20” and “40” parts of a 0W-20/0W-40 grade at 212°F, where higher numbers correspond to thicker oil at operating temperature.

Film thickness refers to the protective oil layer that separates moving engine parts like bearings and crank surfaces. Increasing viscosity can raise film thickness, but it can also be a compromise if the underlying issue is something else.

0W-40 is an engine-oil grade that describes how the oil behaves in cold weather and at operating temperature. The “0W” indicates cold-start viscosity performance, while “40” indicates the oil’s viscosity at high temperature (roughly engine operating temps).

A thicker oil film refers to the oil maintaining a more robust layer between moving engine parts. In theory, that can reduce metal-to-metal contact and wear, especially when engines are operating under load or at higher temperatures.

Viscosity index improvers are additives that help an oil resist changing viscosity as temperature changes. They allow the oil to stay appropriately thick when hot and not become overly thick when cold.

Viscosity modifiers are polymer-based additives that change how the oil’s thickness responds to temperature. As temperature drops or rises, the polymer chains expand or contract, helping the oil “smooth out” viscosity changes.

The Chevrolet Silverado is a full-size pickup truck built for everyday driving as well as heavy-duty work like towing and hauling. In the podcast context, it’s mentioned as a 2021 Silverado 1500 that the owner uses for towing, which is a common reason people discuss this truck. It comes up often because it’s designed to handle real-world truck tasks, not just commuting.

“20-weight” refers to an engine-oil viscosity grade in the “W-20” family (e.g., 0W-20 or 5W-20). Lower “weight” numbers generally indicate thinner oil at operating temperature, which can improve fuel economy but may be less protective if the engine is worn or operating under severe load.

5W-30 is a thicker alternative to lower-viscosity oils like 0W-20, especially at operating temperature. The discussion suggests some owners step up to a higher-viscosity grade for extra protection when they’re towing or when they’re concerned about an older engine’s wear.

“Quarts of oil” refers to the measured volume of engine oil added to the crankcase. Adding too much oil can increase drag and heat, which is why the speaker says power dropped and temperature/pressure rose in the dyno videos.

A dyno (dynamometer) is a test device used to measure how an engine performs under controlled conditions. In this segment, they’re describing a test where adding more oil than intended changed temperature, pressure, and power output.

Towing and hauling are heavy-load driving conditions that increase engine load and heat. The speaker argues that under these conditions, oil heats up more and conventional oils can break down faster, so viscosity and oil type matter.

Oil grade is the viscosity rating (like 20W-40) that describes how thick the oil is at different temperatures. The segment discusses “bumping up a grade” (e.g., 20-weight to 30-weight) and how it can affect fuel economy and engine behavior, especially under towing.

Engine operating temperature is the typical range the engine runs at during normal use. The speaker contrasts older trucks (around 180–195°F) with newer ones (205–215°F) and connects that higher heat to oil choice and emissions-related design.

The breakdown point is the temperature/operating condition where oil starts to lose its protective properties. The speaker uses it to explain why synthetic oil is specified for hotter-running modern engines.

Synthetic oil is engineered to resist breakdown at higher temperatures compared with conventional oil. The speaker ties this to modern engines running hotter for emissions, and argues synthetic is required when the manufacturer’s operating temperature and specs call for it.

Conventional oil is the more traditional, less heat-resistant oil type compared with synthetic. The speaker’s point is that when engine oil gets very hot under towing or grades, conventional oil can break down faster than synthetic.

The Arrhenius rule describes how chemical reaction rates change with temperature. In engine-oil terms, it’s used to estimate that oxidation speeds up rapidly as oil temperature rises—often summarized as “every 10°C increase roughly doubles oxidation rate.”

Engine oil oxidation is the chemical process where oil degrades as it’s exposed to heat and oxygen. In practice, hotter-running engines accelerate oxidation, which can shorten how long oil stays effective even if it’s a synthetic.

Oxidation rate is how quickly engine oil reacts with oxygen and forms breakdown products. Higher oxidation rate means the oil loses protective properties sooner, which is why oil temperature strongly affects oil life.

A thermostat controls engine coolant temperature by regulating when coolant flows to the radiator. The transcript uses thermostat set temperature (e.g., 187°F) to explain how oil temperatures—and therefore oxidation—can differ between vehicles.

The GMC Sierra EV is an electric version of the Sierra pickup line, aimed at buyers who want truck capability with an electric powertrain. The podcast snippet doesn’t go into specific EV details, but it places GMC Sierra in the conversation alongside engine-temperature talk, which is relevant to how vehicles manage heat. It may come up because EV trucks still need effective thermal management for performance and efficiency.

Shear stability is how well an oil maintains its viscosity when subjected to mechanical stress inside the engine. If an oil isn’t shear stable, its viscosity can drop over time, which can worsen lubrication even before oxidation becomes the main issue.

An “ad pack” refers to the additive package in engine oil—chemicals blended to control oxidation, wear, corrosion, and deposit formation. The host suggests that different additive packages can change how long oil survives at high temperatures.

Light ends are the more volatile fractions of oil that can evaporate (“volatilize”) at high temperatures. Losing these fractions can change oil viscosity and leave behind a different blend, which affects how the oil performs and how long it lasts.

An additive package is the blend of chemicals mixed into base oil to make it perform better than plain oil. It helps with things like wear protection, oxidation resistance, and maintaining viscosity so the oil can protect engine components over time.

Change intervals are the scheduled mileage/time periods between oil changes. Extending or shortening them affects how long the oil’s additives can keep protecting the engine before the oil degrades.

A hydraulic lifter is a valve-train component that uses oil pressure to automatically maintain proper clearance between the camshaft and the valve. Because it relies on oil flow and cleanliness, dirty or restricted oil passages can cause lifter malfunction and abnormal noise.

An oil passage is an internal channel in the engine that routes pressurized oil to components like lifters and the top end of the cylinder head. If debris blocks an oil passage, the affected parts may not receive enough clean oil to function correctly, leading to accelerated wear.

The camshaft controls valve opening and closing timing by driving the valve train. In this context, blocked or dirty oil can prevent hydraulic lifters from functioning, which can change how the cam surface is loaded and accelerate wear.

An oil filter is a device that removes contaminants from engine oil as it circulates. Keeping it in good condition helps prevent abrasive wear and helps the oil stay cleaner longer.

Oxidation is a chemical aging process where oil reacts with heat and contaminants, forming sludge and varnish. When blow-by gases get into the oil, they can accelerate oxidation and degrade lubrication performance.

Pennistar is mentioned as the oil brand the host previously used before switching. The host associates it with startup rattle after the vehicle sat because oil drained from the top end.

“Signature Series” is referenced as the oil line the host switched to after Pennistar. They claim it improved lubrication retention, reducing startup clatter by keeping oil film on top-end components.

Stiction is sticky static friction that can cause a brief delay or noise when valve-train parts start moving after sitting. Oils with better film retention can reduce how much the parts “stick” before oil pressure and motion get things going.

The valve train is the set of components that opens and closes the engine’s valves, including parts like camshafts, lifters, and rocker arms. Proper lubrication there is critical, especially after the engine sits.

Fleece is referenced as a company/brand in the diesel performance space that wanted a high-quality engine oil partnership. The hosts discuss how that collaboration led to a specific line of oils.

Viscosity is a measure of how thick or thin an oil is, and it strongly affects how well the oil flows at different temperatures. Multi-viscosity oils are chosen to balance cold-start flow with protection at operating temperature.

Break-in oil is formulated for the early period after an engine is rebuilt or newly assembled. It’s intended to help manage initial wear and contamination while the engine’s internal surfaces mate and stabilize.

“Turbo truck applications” refers to diesel truck setups that use turbochargers, which increase airflow and heat loads. Turbo engines typically need oil that can better resist breakdown and keep internal surfaces clean under higher stress.

Turbo cleanliness describes how well an oil helps prevent deposits from building up on turbocharger components. Cleaner turbos typically mean better airflow and less risk of performance loss from coking or varnish-like buildup.

Extended services refers to longer oil-change or service intervals than standard schedules. The hosts connect this idea to how diesel oil products are formulated and marketed for different usage conditions.

“Light duty” and “heavy duty” describe different classes of trucks with different typical use, durability requirements, and emissions hardware. The episode argues that diesel’s biggest changes recently have been tied to emissions rules and technology differences across these classes.

The fuel injection system delivers pressurized fuel to the engine in precise amounts and timing. If components fail, debris can damage other parts and cause major drivability and repair issues.

After treatment refers to emissions-control hardware used after combustion to reduce pollutants coming out of the exhaust. In modern diesels, it can add complexity, and failures can lead to expensive repairs and drivability issues.

Low sulfur fuels are diesel fuels with reduced sulfur content, introduced to lower emissions and protect modern emissions systems. Changing fuel chemistry can also affect how components like pumps and injectors wear and fail.

Warranty issues are repair costs covered by the manufacturer when a vehicle component fails within the warranty period. In the diesel era discussed here, reliability problems led manufacturers to spend heavily on warranty claims.

EV (electric vehicle) and hybrid powertrains reduce or eliminate the need for diesel engines to meet emissions and regulatory targets. The episode frames this as a strategic shift away from diesel when emissions compliance and reliability costs got harder.

CAFE (Corporate Average Fuel Economy) standards are U.S. regulations that require automakers to meet fleet-wide fuel-economy targets. The hosts connect diesel’s role in meeting these targets to broader regulatory pressure.

Power Stroke is Ford’s diesel engine line, associated with heavy-duty trucks and strong towing capability. In this segment, the hosts call it a class leader in power output among modern diesels.

PC-12 is referenced as a coming diesel-market standard/spec that affects how oils are formulated. The speaker implies it will shrink the “chemical box” by tightening requirements, forcing formulators to adjust additive choices.

Particulate matter (PM) refers to tiny solid or liquid particles created during combustion, commonly discussed in diesel emissions. The speaker links upcoming diesel standards to reductions in particulate matter.

An extended drain interval is the planned time or mileage between oil changes. The speaker contrasts building diesel oil around long-term cleanliness and then extending how long the oil can be used while still meeting performance needs.

“OE” here means original equipment—engine oil formulated to match what vehicle manufacturers specify for normal use. The segment frames Amsoil OE as a synthetic replacement that follows manufacturer-recommended guidelines.

An “original equipment replacement synthetic” is an aftermarket synthetic oil intended to replace the oil type and performance requirements used by the vehicle manufacturer. The point is to meet the same standards so it can be used while following the manufacturer’s guidance.

“Warranty sensitive” refers to choosing products that align with what the manufacturer requires so warranty coverage isn’t jeopardized. In oil terms, that usually means using an oil that meets the specifications listed in the owner’s manual.

A “fully licensed product” implies the oil meets formal licensing or approval requirements tied to performance standards. In practice, this is often about meeting the specifications and approvals vehicle makers and industry bodies require for that oil category.

“Spec missing” means an oil that doesn’t meet one or more required performance specifications for a given application. The segment claims the OE and XL lines avoid this, positioning them as compliant with the needed requirements.

The owner’s manual is the vehicle manufacturer’s official guidance for maintenance, including which oil specifications to use. The segment emphasizes that the OE oil is designed to do exactly what the manual recommends.

An oil life monitor is the car’s system for estimating how much useful life the engine oil has left. It typically uses sensors and driving data (like temperature and engine load) to adjust the service reminder instead of relying on a single fixed mileage interval.

Dexos 1 Gen 3 is General Motors’ specific engine-oil specification that oils must meet to be approved for many GM vehicles. When the hosts mention it, they’re emphasizing that the oil isn’t just “good”—it’s been engineered and tested to satisfy GM’s requirements for performance and protection.

API refers to the American Petroleum Institute’s oil performance categories and licensing program. When the hosts discuss API/SAE ratings and certification stamps, they’re distinguishing between oils that merely claim compatibility versus oils that are actually tested and licensed under the standard.

SAE ratings refer to Society of Automotive Engineers standards used to define oil performance requirements and/or viscosity grading. In this segment, the hosts are arguing that meeting the underlying requirements is more meaningful than seeing a rating printed on the bottle.

“SIG series” is presented as a top-tier, purpose-built motor oil line that’s engineered for long service intervals (“extended drain”). The speaker also frames it as avoiding unnecessary additives and focusing on meeting the needs of the application.

“OEXL” is mentioned as one of the oil tiers alongside “SIG series,” described as the top flagship product. The context suggests OEXL is also a high-end oil offering within the company’s lineup.

An oil analysis program is a process where used oil is tested (often for wear metals, contamination, viscosity change, and additive depletion) to judge how the oil is performing. It helps confirm whether the oil is still protecting the engine and can support warranty or troubleshooting claims.

The top end refers to the upper portion of an engine—typically the cylinder head area where components like valves and valve train parts live. Checking the top end can reveal issues that oil analysis may also help flag indirectly.

An oil sample is the small amount of used oil collected for testing. The timing and collection method matter because they affect how accurately the lab can judge oil condition and engine wear.

High mileage oil is an engine oil formulated for older engines, typically those with higher mileage and more wear. It often uses higher detergency to help clean deposits and seal conditioners to reduce oil leaks from aging seals.

Carbon buildup is deposits that form from combustion byproducts and oil contamination. Over time, these deposits can affect engine efficiency and contribute to rough running, which detergency-focused oils aim to reduce.

Sludge is a thick, sticky buildup formed when oil breaks down and contaminants accumulate. In older engines, sludge can reduce lubrication and contribute to wear, which is why high mileage oils emphasize cleaning additives.

Detergency refers to an oil’s ability to keep contaminants from forming hard deposits. In high mileage oils, boosted detergency is meant to help clean sludge and carbon buildup inside the engine.

In this context, conditioners are additives in high mileage oil that help restore or maintain rubber seals. The goal is to reduce oil seepage/leaks as seals age and harden.

The BYD Seal is an electric car model discussed in the context of “seal conditioners” and cleaning-related claims. The podcast segment focuses on chemical or additive performance—how it cleans and how it behaves—rather than towing or driving. It’s brought up because the conversation is about products and their effects, with the BYD Seal mentioned as part of that discussion.

Fuel dilution is when liquid fuel leaks past the piston rings and mixes into the engine oil. In cold-start-heavy driving (common on hybrids), more fuel can end up in the oil, which can thin it and reduce lubrication.

Corrosion inhibitors are additives in oil designed to slow rust and chemical attack on metal surfaces. They’re especially relevant when engines don’t reach full operating temperature, which allows moisture to persist and promote corrosion.

Moisture/condensation in the crankcase can build up when the engine doesn’t get hot enough to evaporate water. Hybrid driving patterns can increase this because the engine may run fewer minutes per trip, leaving water to accumulate.

A plug-in hybrid (PHEV) can run on an electric battery for short trips, then switch to the engine when the battery is depleted or when conditions require it. Because the engine may run infrequently on short commutes, oil can be exposed to more fuel dilution and moisture-related issues.

OE here means “original equipment,” i.e., the oil spec or product intended for the vehicle when it was new. The speaker is saying that if you start with OE and you’re under certain mileage, you can keep using that approach without issues.

Reformulation is when an oil manufacturer changes the oil’s base-stock blend and/or additive package. Even if the product name stays the same, reformulation can target improvements like wear protection, oxidation resistance, or how the oil handles high-mileage engines.

“Six series” refers to Amsoil’s product line of motor oil. The discussion is about a “reformulation,” meaning the oil’s blend/additive package was changed to improve performance or compatibility while keeping the same intended use.

The Chevrolet Silverado 2500 HD is a heavy-duty pickup, and the 2010 model is part of the GMT900 generation. In this episode, it’s mentioned in the context of an offset steering wheel, which is a notable interior/ergonomic detail for that truck.

An offset steering wheel means the steering wheel sits slightly off-center relative to the vehicle’s straight-ahead direction. It can be caused by alignment issues, steering linkage/suspension wear, or how the steering column is positioned.

A shift fork is a component inside the transmission that moves to engage different gears. If a shift fork breaks, the transmission may fail to select gears correctly, which can lead to drivability problems or a no-gear condition.

The Ford F-150 is a full-size pickup, and the “18” in the transcript refers to the 2018 model year. It’s mentioned as the replacement truck after the speaker decided they needed a new vehicle.

The Hummer H3 is a mid-size SUV built on a truck-based platform, known for its off-road capability and rugged styling. Here it’s specifically tied to a drivetrain-related repair: a shift fork failure.

Bilstein is a suspension brand best known for shock absorbers and struts. The episode mentions “new Bilsteins” on an older GMC truck, implying an upgrade to the shocks to improve ride and handling.

Tongue weight is the downward force the trailer’s hitch applies to the tow vehicle’s hitch. It’s important because too little can make the trailer unstable, while too much can overload the rear suspension and affect steering and braking.