The Diesel Podcast

Latest Episodes:

Don’t Rebuild a 6.7L Powerstroke Without These Upgrades Sep 18, 2026

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Early 6.7L Powerstroke owners can take advantage of the improvements Ford made to the engine in 2020+ models. J&K Engines details how every 6.7L Powerstroke that leaves their facility comes with the updated steel pistons and rotating assembly upgrades seen in current 6.7L Powerstrokes. We discuss how this impacts long-term reliability and performance for those maximizing longevity.

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The Diesel You’ve Never Heard Of Sep 16, 2026

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In this episode, we sit down with J&K Engines to take a closer look at the 4.5L Powerstroke - where it came from, what vehicles it was used in, the years it was available, and what made this unusual diesel different. We also dig into the engine design, including the compound turbo setup found on certain versions, and how the 4.5L compares to the Powerstroke engines most diesel owners are familiar with. If you’re a Ford diesel enthusiast and thought you knew the Powerstroke lineup, this is an engine worth knowing about.

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Biggest Problem with 68RFE’s in 2026 Sep 09, 2026

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John Muldoon from Muldoon’s Performance Transmissions joins us to talk about the biggest problem facing 68RFE’s in 2026. And it’s not what you think. He also tells us common mistakes that happen with transmissions and how we can avoid expensive repairs.

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New Cummins Record from the Bonneville Salt Flats! Sep 04, 2026

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Salty Box Racing set a new diesel record and the team joined us from the track! We go behind the scenes at Speed Week 2026 and learn about their Cummins, challenges in the environment, and the thrill of competing at these intense speeds.

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Best Cummins for an Engine Swap? Sep 03, 2026

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Are some factory engines beyond hope and just need a different engine entirely? Diesel Conversion Specialists joins us to take an in-depth look at all Cummins engines, which make the best swap candidates, and trucks that can benefit most from the conversion

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This Muffler Lets Your Diesel Be Loud OR Quiet Sep 02, 2026

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Glory Days Speed Shop is back on The Diesel Podcast to talk about the latest updates to the Thunder Muzzle and the idea behind giving diesel truck owners control over their exhaust sound. Want an aggressive diesel exhaust when you’re getting on the throttle, but something quieter when cruising down the highway? We talk about how the adjustable muffler is designed to offer both, what’s changed with the latest version, and what they’ve learned from getting the product into the hands of diesel owners. We also get into the story behind Glory Days Speed Shop—from developing an idea and launching a new diesel product to growing the company and figuring out what comes next. If you like the sound of a straight-piped diesel but don’t necessarily want to live with it every mile, this episode is for you.

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Biodiesel is Already in Your Fuel - Why It Matters Aug 25, 2026

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Power Service joins us to talk about biodiesel and what diesel truck owners need to know about the fuel going into their tanks. Biodiesel can offer benefits, but it can also create new challenges for your diesel fuel system. We discuss how biodiesel can contribute to microbial growth, fuel contamination, storage issues, and additional maintenance concerns that truck owners may not realize are happening inside the tank.

We also cover what biodiesel blends mean for modern diesel engines, how fuel quality can affect filters and other fuel system components, and what owners can do to help prevent fuel-related problems.

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Why Diesel Injector Sizing is Confusing Aug 14, 2026

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Diesel injector sizing can get confusing fast. Percent over, hole size, liters per minute (LPM)—what do these ratings actually tell you, and how do you know which injectors are right for your build?

Lenny Reed from Dynomite Diesel Products joins us to break down the different ways diesel injectors are rated and why comparing injectors isn't always as straightforward as the numbers make it seem. We talk about what “percent over” actually means, flow ratings, injector sizing, and why choosing the right injector needs to match the horsepower goals and overall setup of your truck.

Whether you're building a Cummins, Duramax, or Power Stroke, understanding injector sizing can help you make better decisions before spending money on your fuel system.

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Cooling System Mistakes That Can Hurt Your Engine Aug 12, 2026

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Modern diesel engines generate a lot of heat, and keeping that heat under control puts a huge demand on the cooling system. But how often should you actually change your coolant, and what happens when you leave it in too long? Rislone joins us to talk about diesel cooling systems, proper coolant maintenance, and some of the common mistakes truck owners make. We discuss corrosion and contaminants that can build up over time, how coolant condition can affect heat transfer, best practices when changing coolant, and why maintaining the cooling system is so important on modern Cummins, Duramax, and Power Stroke engines.

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You Could Be Buying the Wrong Fuel Filter Aug 07, 2026

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Not all diesel fuel filters are created equal—and choosing the wrong one could affect your truck's performance, reliability, and even the life of your fuel system. On this episode of The Diesel Podcast, we sit down with S&S Diesel Motorsport Chief Engineer Ian McGiffen to discuss what separates a quality fuel filter from the rest. We cover filter media, micron ratings, filtration efficiency, common marketing claims, and why two filters that look nearly identical can perform very differently. We also dive into a common failure point on the 6.7L Power Stroke: the factory plastic fuel filter housing. Learn why it can crack, create fuel leaks, cause drivability issues, and why many owners are upgrading to a more durable solution.

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