Fuel cetane boost additives
In my old 96 300 Cummins I've been using Opti-Lube boost for several years. It absolutely gives me more power in a 12 valve and cleans the engine.
Please, no arguments. I know what I know and feel. The new diesel fuel is dumbed down to a point you need to add lubricity and cetane boost. Can you go without, sure. Injectors are cheap on a 12 valve! ha ha