Poor quality fuel leaves carbon deposits on injector nozzles. Using the right additives improves the "digestibility" of the diesel, boosting the cetane rating and ensuring a clean, powerful burn.

Cetane is to diesel what octane is to gasoline—it dictates how quickly and smoothly the fuel ignites under pressure. Winter-blend diesels often have lower cetane ratings, causing hard cold starts and excessive engine knock. High-quality diesel treatments add synthetic lubricants for the fuel pump and cetane improvers that reduce the ignition delay, resulting in more power and less soot accumulation in the DPF filter.