With the advancement of diesel fuel engine technology over the last 2 decades, it is no longer recommended that B-12 Chemtool be added to diesel fuel to clean diesel fuel system components. Berryman makes an entire group of fuel additives: B-12 Motor Tune-Up (#0316), a multi-task universal additive, and Diesel Injector Cleaner (#0518) for cleaning injectors; Diesel Cetane Booster (#0517) for increasing cetane, and All Season Diesel Fuel Treatment (#0512) for inhibiting crystallization of wax paraffin, keeping injectors clean, and lubricating parts.