Filtered Power: DGF429 Versus Duramax Needs... (Tested) When it comes to keeping our lifted Duramax trucks running smoothly, fuel quality is just as crucial as it is for any high-performance engine. That’s why we tested the Doc’s Diesel Fuel Filter DGF429, specifically designed for Chevrolet/GMC 6.6L Duramax 2500HD, 3500HD (2017-2019) and 3.0L Duramax 2500HD, 3500HD (2020+). Replacing the OEM part TP1015, this filter delivers exceptional filtration without compromising flow, ensuring our engines stay чистые под капотом. Performance was steady across all conditions, and the installation was straightforward. The DGF429 doesn’t just meet our needs; it exceeds them, offering a blend of durability and efficiency that’s hard to beat. If you’re running a Duramax, this is one upgrade we’d recommend keeping in stock.