PRI 2025: Fleece Performance And Amsoil Reveal Freedom Series Lubricant

If you spend any time around high-performance diesel engines, you know that oil is more than just maintenance; it is a component that determines survival. Recognizing this, Fleece Performance Engineering and Amsoil have announced a strategic partnership that brings their combined expertise to the consumer market. Launching in spring 2026, the Freedom Series is a new line of co-branded lubricants developed to handle the unique stresses of diesel performance, from cold starts to full-boost dyno pulls.

The logic behind the Freedom Series is straightforward. Fleece Performance Engineering has built a reputation in Pittsboro, Indiana, for manufacturing some of the best hard parts in the industry, particularly when it comes to fuel and air management. Amsoil, headquartered in Superior, Wisconsin, virtually invented the market for premium synthetic automotive lubricants. By combining Fleece’s real-world data on engine failure points with Amsoil’s chemical engineering capabilities, they have created a product line specifically tuned for the modern diesel enthusiast.

The new lineup is comprehensive. It features three viscosity options for standard use—10W-30, 5W-40, and 15W-40—all of which are 100 percent synthetic. These are designed to maximize turbo cleanliness and control soot, which are vital for longevity in modern variable-geometry turbo applications. For the dedicated race builds, the series includes a heavier 15W-50 synthetic racing oil, and for the engine builders, there is a specialized SAE 30 break-in oil.

Brayden and Chase Fleece were quick to point out that this isn’t a new experiment for them; they have been consumers of Amsoil products in their race programs for a long time. This partnership essentially validates what they have already proven on the track. For the consumer, accessibility will be easy. You won’t have to hunt for these specialized fluids, as they will be available through Fleece’s wholesale channels and the massive Amsoil Dealer Network. It is a win for anyone who wants to ensure their Power Stroke, Cummins, or Duramax is running the best fluid possible.