Two giants in the diesel performance industry are joining forces to solve one of the most important factors when it comes to engine building: lubrication. Fleece Performance Engineering, a shop known for pushing the absolute limits of diesel hardware, has officially teamed up with the lubrication experts at AMSOIL. The result of this collaboration is a new co-branded line of fluids dubbed the Freedom Series, set to hit the market in the spring of 2026.
This partnership makes perfect sense when you look at the history here. Brayden and Chase Fleece, the founders of Fleece Performance, have been running Amsoil products in their competition engines for years. They know exactly what kind of abuse a high-horsepower diesel engine dishes out, from extreme cylinder pressures to the intense heat generated by compound-turbo setups. By formalizing this relationship, they are essentially bottling that race-proven reliability for their customers. The Freedom Series isn’t just a single product; it’s a comprehensive lineup designed to cover everything from a fresh engine build to a dedicated competition truck.
The range will include 10W-30, 5W-40, and 15W-40 100-percent synthetic diesel oils for the daily drivers and tow rigs. For the serious competitors, there is a 15W-50 100-percent synthetic racing oil, and critically, an SAE 30 break-in oil to ensure those expensive new rings seat properly. Engineered by AMSOIL, these fluids are specifically formulated to tackle the biggest enemies of modern diesel engines: soot accumulation and turbo coking. Keeping the turbo bearings clean and maintaining viscosity under high shear is non-negotiable when you are chasing big power numbers.
Amsoil CEO Alan Amatuzio noted that the collaboration was a natural fit given Fleece’s “quality-first mentality.” It aligns perfectly with AMSOIL’s reputation for pioneering synthetic technology. For enthusiasts waiting to get this protection into their own crankcases, the wait won’t be long. The entire line will be distributed through Fleece’s dealer network as well as Amsoil’s established online and dealer channels. Come spring 2026, diesel owners will have a new premium option that carries the seal of approval from two of the most trusted names in the game.
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