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Spring Diesel Maintenance Most Truck Owners Forget

Spring Diesel Maintenance Most Truck Owners Forget

The Diesel Podcast Mar 31, 2026 56 min
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About this episode

Spring is the “reset button” for diesel trucks after months of cold starts, idling, and temperature swings that quietly degrade fuel and oil systems. The hosts break down why moisture and bio-attracted water lead to oxidation, how winter fuel variety increases soot and DPF load, and why a deep fuel clean with diesel extreme (plus a stronger rail-plumbed diesel injector flush when needed) can restore efficiency. They also cover oil-side issues like fuel dilution and total base number dropping over time, recommending oil cleaning plus oil analysis. The discussion ties it all to preventing expensive injector/DPF problems and includes product and event updates.

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Technical Too Afraid to Ask
Concept

freezing diesel fuel

"...we had talked a couple of times about freezing diesel fuel and all the issues that we have in winter."

In winter, diesel can get thick and start to gel. When that happens, the truck may be hard to start because fuel can’t flow the way it should.

Term

lubricity additive

"I'm sorry, injector cleaner, c-tain booster, water demulsifier, lubricity additive,"

Lubricity additives help diesel act more like a lubricant. That can protect the precision parts in the fuel system from extra wear.

Term

injectors

"...all the way to the rail through the injectors, get everything flushed out and give you a clean start for the year."

Injectors are the parts that spray fuel into the engine. If they get dirty, the engine can run rough or not burn fuel as well.

Term

DPF

"...we see so much more idol hours and you're right, you're sending a lot more particulate to the DPF, if it's a emissions truck... So, um, now on a DPF system, it's going to actually be cleaning itself out with"

DPF means a filter that catches the dirty soot from a diesel exhaust. Over time it has to clean itself out, or it can get clogged and cause problems.

Company

diesel extreme

"So, uh, diesel extreme is the product that you'd use, um, that's going to clean up all that soot and carbon deposits that are left behind. Now it's not going to clean out your DPF."

Diesel Extreme is a diesel additive/product the host recommends to help clean out soot and carbon. They also say it won’t fully “fix” a DPF if the filter isn’t regenerating correctly.

Term

lubricating the fuel

"Like the, the adding side just comes from the C-tane boost and the lubricating the fuel that's keeping the pump, you know, lubricated."

Many diesel fuel treatments include lubricity additives to improve the fuel’s lubricating properties. This matters because diesel fuel lubricates components in the fuel system (especially high-pressure pumps), reducing wear.

Term

C-tane boost

"So there's two gains that you get from the diesel extremes... Like the, the adding side just comes from the C-tane boost and the lubricating the fuel that's keeping the pump..."

Cetane is a property of diesel fuel that affects how easily it burns. A “cetane boost” additive is meant to help the engine burn the fuel more cleanly and reliably.

Term

additive solution

"...a lot of times people don't look for an additive solution until [907.7s] they have a problem."

A fuel additive is something you pour into the tank to help keep the fuel in better shape. The point here is that people often wait until the truck is already acting up.

Term

stabilizing

"...demulsifying, stabilizing and rust inhibiting does all of those."

Fuel stabilizers slow down fuel oxidation and degradation during storage. For diesel owners, this matters when trucks sit for periods or when fuel quality varies by season and supply chain.

Term

rust inhibiting

"...stabilizing and rust inhibiting does all of those."

Rust inhibitors are additives that help protect metal surfaces in the fuel system from corrosion. This is particularly relevant when water contamination is present or when fuel sits for long periods.

Term

cents per gallon

"So, uh, yeah, I get it. ... you’re talking a few cents per gallon to treat."

Additives are often priced as a small amount per gallon of fuel. That makes it easier to judge if it’s worth it compared to the cost of diesel itself.

Company

Hot Shot Secret

"...And then with a company like Hot Shot Secret and your dealer network, now"

Hot Shot Secret is a company that sells diesel-related products, like additives. They’re mentioned because their network can help collect information from many trucks, not just one.

Concept

R and D

"if there's consistent issues out there and we're all kind of. That, that's what feeds our R and D here."

R and D means research and development. It’s how a company tests ideas and improves products based on what customers are experiencing.

Company

hotshotseeker.com

"So we sell direct on our websites. You can go to hotshotseeker.com and buy our products."

They’re saying you can buy their products online directly from their website. That means you don’t have to go through a store or dealer to get diesel parts.

Concept

canaries in the coal mine

"They're the ones finding the issues with these vehicles before they, before it's widely known, um, and you're right, our, our shops, our diesel, uh, partners that are our dealers are our best like canaries in the coal mine."

“Canaries in the coal mine” is a metaphor for early warning. In this context, dealers and repair shops see symptoms first in real-world use, before the broader industry fully recognizes the pattern. That early detection helps identify root causes and triggers fixes like TSBs.

Brand

DFC diesel

"[1741.8s] DFC diesel is a sponsor of the podcast. [1744.9s] We worked with them, you know, hand in hand on doing episodes, answering [1747.7s] technical questions, they have a complete lineup of Cummins, Duramax and Power"

DFC diesel is a company that sells diesel truck parts and engines for people who want upgrades or replacements. In this episode they’re sponsoring and helping with technical info.

Concept

OEM engine

"[1775.8s] sometimes the options [1775.8s] that are out there, it's just, it's a basic OEM engine. [1778.2s] You want a little bit more."

An OEM engine is the factory-style engine, built to the original design. The host is saying that sometimes you want something more than the basic factory spec.

Concept

better fuel economy

"[1812.1s] So you can add that into your build and be able to get better fuel economy, [1816.3s] you know, increased power, increased torque and better engine life out of it."

Fuel economy is how efficiently an engine converts fuel into usable work, usually measured as miles per gallon (or similar metrics). The host connects the piston/engine build choices to improved fuel economy, implying efficiency gains from better combustion and airflow.

Concept

increased torque

"[1812.1s] So you can add that into your build and be able to get better fuel economy, [1816.3s] you know, increased power, increased torque and better engine life out of it."

Torque is the twisting force an engine produces, which strongly affects how strongly a truck accelerates and how well it pulls at low to mid speeds. The host groups increased torque with the other benefits of the upgraded engine/piston setup.

Company

fastride.com

"Visit fastride.com to find the perfect fuel system upgrade for your truck."

They’re pointing you to a website where you can shop for a fuel upgrade. The idea is to find the right setup for your truck.

Term

urea and water

"[1949.1s] You know, death fluid itself is is urea and water. [1953.0s] It's a very poor product or it's just some nasty stuff, but it"

DEF is made by mixing urea with water. The truck relies on that exact mixture to make the emissions-cleaning system work.

Term

fuel dilution

"We're dealing with, uh, so we're looking, we're dealing with, uh, fuel [2250.6s] dilution. [2251.6s] Um, we're looking at water in the system."

Fuel dilution means some diesel fuel ends up mixed into the engine oil. That can make the oil thinner than it should be, which isn’t great for protecting engine parts.

Term

detergent

"One thing is a little different on the oil side that I think a lot of people [2264.8s] forget is that in your diesel oil, um, we have, we have detergent."

Detergent is an additive in oil that helps keep the engine cleaner by preventing gunk from sticking to parts. It helps manage buildup from normal diesel operation.

Term

oil filter

"So then it just gets picked up in your oil filter or once you get done with that interval, when you dump your oil, all that nasty gunk is coming out with it."

An oil filter traps suspended contaminants as oil circulates through the engine. The speaker is describing a cleaning mechanism where loosened deposits end up captured by the filter or removed at the next oil change.

Term

oil analysis

"But as soon as you introduced oil analysis, uh, which doesn't cost much, I, we do analysis at, at cost here at hot shots."

Oil analysis is when you send a little sample of your used oil to a lab. They look for signs of engine wear or dirt in the oil so you can spot issues before they become expensive repairs.

Term

oil change

"These kits are, I think 25 bucks. Um, and that even comes with like a prepaid mailer. So comes you fill it up on your oil change and you just drop it in the bag"

An oil change is when you drain the old oil and put in fresh oil. It’s part of keeping the engine clean and lubricated.

Term

baseline

"because the first oil analysis is kind of like, yeah, it's kind of like a shot in the dark. It's kind of a baseline kind of see a snapshot of time where we're at."

A baseline is your first oil test result that acts like a starting point. After that, future tests are compared to see if things are getting better or worse.

Company

kershaw.kaiusa.com

"Make sure and head on over to kershaw.kaiusa.com. [3314.4s] Use code 20 TD eight FR 26 to get 20% off your order."

That link is the sponsor’s store website. They’re telling you where to go to buy something with a discount code.

Term

EDC

"Whether it's a new knife or EDC hunting, fishing, something around the job [3327.1s] side around the house, they've got you covered"

EDC means “everyday carry.” It’s the kind of knife you’d keep with you for normal daily tasks.

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