REV XDistance Plus Gold Diesel High Lubricity Fuel Treatment - 8 fl. oz. (2)

Seems to make my engine run smoother over 300K on my engine

Edit add sulfur to the fuel which the fuel companies are taken out for diesels in the long run will give you more long life for your engine

So far it has done what it claims. Improved fuel mileage. Engine is running smoother.

Does exactly what I need