Archoil AR6500 Diesel Treatment Additive, 10.1 oz, 4-Pack, 400 Gallons

Each bottle treats up to 100 gallons (400 gallons total). BOOSTS CETANE UP TO +8: Raises cetane up to 8 points for faster ignition, smoother combustion, and improved drivability; many engines run best around 48–50 while pump diesel is often 40–45.