The Truth About Oil Additives

Engine oil is the oil used inside an engine to lubricate moving parts, reduce friction, and help carry heat away. In the context of oil additives, it’s the base fluid that additives are blended into to improve protection and cleanliness.

Oil additives are chemical ingredients blended into base oils to improve specific properties like oxidation resistance, deposit control, and wear protection. The host contrasts early lubricants that had little to no additives with modern oils that rely on them for consistent performance.

Carbon deposits are solid residues that form when oil breaks down or burns, leaving dark buildup inside the engine. Additive packages and better base oils help reduce deposit formation to maintain oil flow and protect components.

In this lubrication context, erosion refers to material loss or surface damage caused by degraded lubricant performance—often tied to poor protection and contamination. The host’s point is that early, inconsistent oils could contribute to erosion because they weren’t refined and formulated to perform reliably.

Detergents and dispersants are additive types that help keep engine oil clean. Detergents help prevent deposits from forming on internal surfaces, while dispersants help suspend soot and other contaminants so they don’t clump together.

Piston rings are the sealing rings on the piston that control compression and limit oil consumption. When they get “stuck” due to deposits, they can lose their ability to seal properly, leading to blow-by (gases escaping) and increased oil burning.

Carbon buildup refers to deposits that form inside the engine when combustion byproducts and oil contaminants aren’t controlled. Over time, these deposits can contribute to sticking components and reduced efficiency.

Crankcase sludge is a thick, tar-like buildup formed from oxidized oil, soot, and moisture. It can restrict oil flow and increase wear by preventing oil from reaching critical engine components.

Kerosene is a fuel-like liquid that was sometimes used historically as an engine flush between oil changes to dissolve deposits. In modern practice, flushing with fuels is generally discouraged because it can dilute oil and compromise lubrication.

Oxidation inhibitors are oil additives that slow the chemical oxidation of engine oil. Oxidation breaks down oil and accelerates deposit formation, so inhibitors help maintain oil stability and extend service life.

Pour point depressants are additives that lower the oil’s pour point, meaning it stays fluid at colder temperatures. This improves cold-start lubrication and helps prevent oil from gelling in freezing conditions.

Anti-foam agents reduce foaming in engine oil. Excess foam can interfere with oil pressure and lubrication because air bubbles don’t lubricate like liquid oil.

Rizzlone is presented as an engine-treatment product that appeared in 1921. In this segment, the host frames it as an oil additive approach aimed at cleaning, restoring, and protecting engine systems.

An additive package is the blend of chemicals mixed into base oil to achieve specific performance goals. Different packages target things like wear protection, detergency, corrosion resistance, and oxidation stability.

Viscosity is a measure of how thick an oil is and how easily it flows. In engines, the right viscosity helps the oil form a protective film at both cold starts and high operating temperatures.

10W-40 is an oil viscosity grade where “10W” indicates cold-flow behavior (not as free-flowing as 0W oils) and “40” indicates the oil’s thickness at high temperatures. Higher-temperature viscosity like “40” generally provides a thicker protective film under heat.

Deposit control refers to additives that prevent harmful sludge and varnish from forming inside the engine. Keeping deposits down helps maintain oil flow paths and reduces the risk of sticking or reduced performance over time.

Anti-wear additives are chemicals in engine oil designed to reduce metal-to-metal contact. They help protect critical components like cam and lifter surfaces by forming a protective layer under load.

In engine oil, detergents are additive chemicals designed to keep contaminants suspended and help prevent deposits from forming on internal engine surfaces. They’re especially relevant for older engines that may have more existing sludge or varnish.

Base oil is the base lubricant stock that engine oil is built from before additive packages are blended in. Its refining and quality level largely determine properties like viscosity behavior and how well the final oil can handle heat and wear.

Engine tolerances are the designed clearances between moving parts, which influence how much oil film is needed to prevent metal-to-metal contact. Because those clearances vary by engine design, the manufacturer specifies an oil viscosity range that best maintains lubrication across operating temperatures.

In oil viscosity ratings, the “W” stands for winter, indicating the oil’s cold-temperature behavior. A lower “W” number generally means the oil flows more easily when it’s cold, which helps protect the engine during startup.

“OEM recommended” means the oil specification and viscosity grade the vehicle manufacturer (OEM) calls for. Following it matters because engine clearances, oil pump behavior, and lubrication design are calibrated around that spec.

“Slinging” describes how rotating engine components (like crankshaft and connecting rods) use motion to distribute oil through the engine. If the oil is too thick for the design and temperature, it may not be moved to all lubrication points effectively.

“Oil weight” refers to the oil’s viscosity grade (commonly written like 5W-40). It describes how thick or thin the oil is at cold start and at operating temperature, which affects how well it flows to engine parts.

Synthetic oil is engineered to have more consistent viscosity and better performance across a wider temperature range than conventional oil. In hot climates, that consistency helps maintain lubrication when oil would otherwise thin out.

“Change intervals” are the scheduled mileage/time periods when you replace engine oil. Following the interval matters because oil additives and the base oil’s ability to protect the engine degrade as the oil ages and accumulates contaminants.

OEMs (Original Equipment Manufacturers) are the vehicle and engine makers that specify what oil performance they require. The segment describes oil companies formulating base oil and then tailoring additive packages to match those OEM needs.

“Higher mileage engines” are engines with substantial accumulated use, where deposits and wear patterns are more likely to be present. The host’s point is that additive packages (especially detergents) can help with cleanliness and protection even when oil changes are done on schedule.

Friction is resistance to motion between parts, and wear is the gradual material loss from rubbing. Oil additives are often marketed as reducing both by improving lubrication and protective film.

Film strength is the additive’s ability to help engine oil form a protective lubricating layer between moving parts. Stronger oil film helps reduce metal-to-metal contact, which lowers friction and wear.

The rear main seal is the seal at the back of the engine that prevents oil from leaking where the crankshaft exits the engine block. The host ties additives/conditioners to helping seals stay flexible and resist leaks over time.

In this context, “conditioners” are oil additives meant to condition rubber and seal materials so they don’t harden. The goal is to reduce seal-related leaks and issues even if the engine isn’t already leaking.

ZDDP (zinc dialkyldithiophosphate) is an oil additive package that helps protect engine wear surfaces, especially under high load and boundary-lubrication conditions. It’s commonly discussed for older engines because many modern oils contain less ZDDP to protect emissions equipment. In this segment, the host connects lower ZDDP levels in newer oils to reduced protection for older cam and valve-train setups.

“Flat tap” refers to a flat-faced cam follower/tappet contact style that can be more sensitive to oil film strength and anti-wear chemistry. In practice, these older or specific valvetrain designs may benefit more from higher-ZDDP oil additive levels. The host is implying that older cam/follower setups can need extra protection compared with what modern low-ZDDP oils provide.

“Regear it” means changing the final-drive gear ratio (typically by swapping differential gears) to alter how the truck accelerates and how it cruises at speed. Higher numerical ratios usually improve low-speed pulling and towing feel, while lower numerical ratios can reduce engine RPM on the highway. The host lists it as one of the common customization changes diesel truck owners make.

“OW-20” is shorthand for an engine oil viscosity grade: 0W means it flows well when cold, and 20 is the viscosity rating at operating temperature. It’s a common spec used to help engines start easily in cold weather and reduce friction for fuel economy.

An oil stabilizer is an additive package intended to keep engine oil properties from breaking down over time and under heat. In the context of towing and heavy-duty use, it’s meant to help the oil maintain its protective behavior so it can better handle combustion byproducts and stress.

“Emission systems” on diesel trucks are the aftertreatment components designed to reduce pollutants like soot and nitrogen oxides. The speaker’s point is that these systems increase the importance of controlling oil-related deposits and ash so they don’t interfere with emissions performance.

Excessive ash refers to the non-combustible residue left behind when certain oil additives burn. In diesel engines—especially those with emissions aftertreatment—too much ash can accumulate and contribute to clogging or reduced system effectiveness.

Phosphorus is an element that can be present in some engine oil additive chemistries (often related to anti-wear packages). In diesel applications with emissions systems, phosphorus can be problematic because it may contribute to ash-forming residues or interfere with aftertreatment performance.

The “emission system having issues” refers to faults in the diesel exhaust aftertreatment components and controls that manage soot and NOx. When these systems malfunction, repairs can be extremely expensive and may require towing and dealer-level diagnostics. The episode frames oil cleanliness and maintenance timing as part of preventing those failures.

Fail-safe mode (often called “limp mode” in everyday talk) is a protective strategy where the engine and emissions controls restrict power to prevent damage. It’s commonly triggered by detected faults in sensors or emissions components like the DPF. The driver may feel reduced acceleration and may need service to clear the underlying issue.

“Teflon type seals” describes seal materials or seal designs that use PTFE (often described as Teflon) or similar low-friction polymers. These materials can handle heat and chemical exposure differently than conventional rubber seals. Additives may be formulated to condition or swell compatible seal materials, so the seal type affects what works.

SCR (Selective Catalytic Reduction) is an emissions system used on many diesel vehicles to reduce nitrogen oxides (NOx). It relies on a chemical dosing process (commonly diesel exhaust fluid) to make NOx react in the catalyst. If oil is burning and gets into the exhaust, it can foul or degrade SCR components, shortening their service life.

“DOC” typically means Diesel Oxidation Catalyst, an early emissions-catalyst stage on many diesel exhaust systems. It helps oxidize pollutants in the exhaust stream before later components like SCR. Oil contamination from burning oil can foul the catalyst surface and reduce effectiveness.

API refers to the American Petroleum Institute, which publishes engine-oil standards and specifications. When API updates specs, it can change what oil/additive packages are required to protect against (like wear, oxidation, and fuel-economy-related targets).

Fuel economy in this context refers to how engine oil affects how much energy the engine needs to move and pump the oil. Lower-viscosity or friction-reducing additive strategies can reduce internal losses, which API and OEMs may target in newer oil specs.

Durability (in oil-spec language) is how well an oil and its additive package keep protecting the engine over extended use. The speaker is emphasizing that recent API changes have focused heavily on long-term engine protection rather than only short-term performance.

CK-4 is an engine-oil performance specification for heavy-duty diesel engines, set by the API (American Petroleum Institute). It defines minimum requirements for things like soot handling, wear protection, and oxidation stability so oils can be certified for modern diesel service.

F-A4 is another API engine-oil performance category referenced alongside CK-4 for diesel applications. The key point is that different “specs” correspond to different certified performance targets for modern diesel engines and emissions-related oil needs.

FB-4 is the other upcoming API diesel engine-oil performance specification paired with CL-4 for the 2027 transition. Together, these new specs signal updated certification requirements for how oils protect engines in modern diesel duty cycles.

CL-4 is an upcoming API engine-oil performance specification mentioned as replacing older diesel oil categories starting in 2027. It indicates the industry is moving to newer certified oil performance targets for newer diesel vehicles.

The host is describing a validation process: when new oil specs arrive, they obtain the new oils and rerun lab tests to confirm the additive product still performs as intended. This is about ensuring compatibility with the new certified oil chemistry and performance targets.

Reformulating means changing an oil’s additive package and base-oil blend to meet new performance requirements. The host describes how spec changes can force a product to be adjusted so it functions the same way under the updated certification targets.

An oil additive is a formulated chemical package mixed into engine oil (or added separately) to improve specific properties like wear protection, detergency, corrosion resistance, and sometimes fuel economy. In older diesel trucks, additive packages can be especially relevant because the oil requirements may not match what the engine and emissions hardware were designed for.

DPF stands for diesel particulate filter, a modern emissions device that traps soot from diesel exhaust. Oil additives and oil choice matter because certain oil properties can increase ash deposits that can clog the DPF over time, affecting maintenance intervals and regeneration behavior.

In this context, “DF” is being grouped with DPF as part of diesel emissions hardware, likely referring to a diesel filter system. The key idea is that older trucks lacked these emissions components, so modern oil specifications (and additive chemistry) may not be directly compatible with older engines and their lubrication needs.

An oil sample is a small amount of used engine oil taken from the engine for lab testing. It’s used to check things like contamination, wear metals, and additive depletion so you can see how the oil is performing between oil changes.

In this context, analysis means lab testing of used oil to quantify wear and oil condition. Common outputs include wear-metal levels (from engine parts), soot/contamination, and whether additives are being consumed.

An oil change is the scheduled replacement of engine oil (and often the oil filter) to restore lubrication and additive performance. The transcript highlights comparing results “from oil change to oil change,” which is essentially tracking how the oil and additive package degrade over time.

Oil cleanliness refers to how free the oil is from contaminants and suspended soot/oxidation products. In oil analysis, cleanliness is used as a proxy for how well the oil (and its additives) are preventing sludge and deposits.

An oil flush is a service where a special flushing fluid is run through the engine (or sometimes added and circulated) to help loosen and remove old deposits before changing the oil. It’s often marketed as a way to clean sludge and varnish, but it’s not the same thing as using an additive in normal oil-change intervals.

A diesel engine is an internal-combustion engine that compresses air to very high pressure, then injects fuel so it ignites from the heat of compression. It’s commonly used in trucks because it tends to make strong low-end torque and can be efficient under heavy loads.

Remanufactured engines are rebuilt using a core engine (the original used unit) that’s disassembled, inspected, and restored to a specified standard—often with new or refurbished internal parts. In this segment, the claim is that DFC Diesel’s remanufactured engines meet defined quality standards.

Duramax is General Motors’ heavy-duty diesel engine family (often associated with GM trucks). The host is listing it as one of the remanufactured diesel engine options available through DFC Diesel.

Cummins is an engine brand best known for building heavy-duty diesel engines used in many commercial trucks. In this segment, it’s referenced as part of DFC Diesel’s remanufactured-engine lineup.

Powerstroke is Ford’s heavy-duty diesel engine family. The segment mentions it alongside Cummins and Duramax as part of DFC Diesel’s remanufactured-engine lineup.

ISO 9001:2015 is a widely used international standard for quality-management systems. When a remanufacturing shop says it meets ISO 9001:2015, it’s claiming the company’s processes for inspection, documentation, and consistent output are controlled and audited.

In this context, warranty refers to the coverage terms offered when you buy a remanufactured engine—what failures are covered, for how long, and under what conditions. The host emphasizes the warranty is “comprehensive,” implying fewer gaps in coverage compared with typical aftermarket offerings.

Decibels (dB) are a unit for measuring sound level. When the host says they reduced noise by a certain number of decibels at idle, they’re describing how much quieter the engine sounded under test conditions. Because dB is logarithmic, even a modest change can be noticeable.

The four ball wear test is a standardized tribology test used to compare how well lubricants and additives reduce wear. A set of steel balls is loaded and rotated under controlled conditions, and the wear scar size is measured.

An engine treatment is an aftermarket additive product you mix with the oil (or sometimes fuel) to change how the engine oil behaves. In this segment, the host specifically connects it to detergent action to help loosen and remove deposits.

A maintenance program is a planned schedule and set of practices (like oil changes and additive use) intended to keep wear and deposits under control. In this segment, the host argues that oil additives make more sense when they’re part of an ongoing maintenance approach rather than a one-off fix.

DF fluid is a common shorthand for diesel exhaust fluid used in modern diesel emissions systems. It’s used to reduce nitrogen oxides (NOx) in exhaust aftertreatment, and issues with it can trigger diagnostic trouble codes.

Diagnostic trouble codes (often just called “codes”) are stored by a vehicle’s onboard computer when it detects a fault. The host is referencing codes related to diesel emissions systems and DF fluid, which can indicate problems that affect drivability or emissions compliance.

“Sensors” in modern diesel trucks are used to monitor engine and emissions conditions so the computer can control aftertreatment. If sensor readings drift out of expected ranges, the truck can log fault codes and may require specific corrective actions to keep emissions systems operating correctly.

The “DF system” treatment refers to how a diesel exhaust aftertreatment system is managed to control emissions. In practice, it’s usually about using a fluid-based process that helps the system stay clean and keep meeting emissions requirements.

“Crystallization buildup” describes deposits that can form inside diesel exhaust aftertreatment components when the exhaust treatment process doesn’t stay within ideal operating conditions. Those deposits can reduce performance and contribute to fault codes by restricting flow or interfering with chemical reactions.

“DEAF” here appears to be a transcription of “DEF,” which is the diesel exhaust fluid used in many modern diesel trucks. DEF is injected into the exhaust stream to help convert harmful nitrogen oxides (NOx) into less harmful emissions, but it can also contribute to deposits if the system isn’t managed correctly.

In diesel emissions systems, urea refers to the AdBlue/DEF fluid used in Selective Catalytic Reduction (SCR). It gets injected into the exhaust, where it breaks down into ammonia that helps the catalyst convert nitrogen oxides (NOx) into less harmful gases.

DEF stands for diesel exhaust fluid, a urea-water solution used in modern diesel aftertreatment to reduce nitrogen oxides (NOx). It’s stored in a dedicated tank and dosed into the exhaust system to enable chemical conversion of NOx. The segment focuses on how DEF quality, storage, and dosing can affect system operation.

The speaker is referring to DEF concentration tolerance—how close the urea content must stay to specification. They say the allowable deviation is about ±0.3%, and that their product testing aims to ensure adding it to the DEF tank won’t push the mixture outside that range. Staying within the concentration spec is important for correct aftertreatment operation.

A float level sensor uses a buoyant float that rises and falls with the fluid level. As the float moves, it changes an electrical signal so the vehicle can estimate how much DEF is in the tank.

An ultrasonic pulse is a sound-wave signal sent out to measure distance or level. In DEF tanks, ultrasonic sensing can estimate fluid level by timing how long the sound takes to reflect back from the fluid surface.

Freeze point is the temperature where a fluid changes from liquid to solid. For DEF, lowering the freeze point matters because cold weather can otherwise cause the system to gel or stop working correctly.

Heaters in the DEF system warm components to prevent freezing and maintain proper fluid behavior. This helps ensure the dosing and emissions-control process continues through winter conditions.

The Jeep Commander is a mid-size SUV designed for family use and everyday driving, with seating and space aimed at practicality. It may come up in a diesel-focused discussion because owners often compare how different vehicles handle real-world conditions and long-distance use. The podcast context suggests it’s being mentioned as part of a personal or historical story rather than as a technical deep dive.

“Evolution of automotive” here is the idea that vehicle technology changes over time—engine oil formulations, emissions needs, and durability requirements all shift as cars and trucks get more advanced. That’s why oil additives and oil chemistry also evolve.

In this context, “clay” refers to a specific product or additive history discussed by the hosts, not the everyday material. The mention is likely tied to how older oil treatments were formulated or marketed.

Stop leak is an oil additive intended to reduce or temporarily seal oil leaks. It typically swells or coats certain leak paths (like seals or small seepage points), but it can be a band-aid rather than a fix for the underlying problem.

The Ford Model T is an early mass-produced automobile that helped kick off widespread car ownership in the United States. It’s often used as a reference point when discussing how far automotive technology and manufacturing have evolved—from simple early engines to today’s advanced diesel-powered trucks. Because it represents the start of modern automotive scale, it’s a common “before and after” example in historical conversations.

Torque is the twisting force an engine produces, and it strongly influences how quickly a vehicle can accelerate and how well it can pull heavy loads. Diesel trucks are often discussed in terms of high torque because it helps with towing and hauling.