Originally posted by Texas Resistance:
The new low sulfur fuel is lacking in lubrication so adding oil to the fuel will make the injector pump last longer. Changing the differential to one with a lower numerical ratio like a 2.73 will increase fuel mileage and make the engine last longer by reducing the rpm it turns at highway speed.
Parking your big Blazer or pickup and driving a small economy car when you don't need to haul anything will make you Blazer or pickup last longer.
Take it from someone that works in a lab for a major oil company. Don't put motor oil in your diesel. Motor oil has detergents that work well in the oil but can cause deposit buildup in the combustion chamber. ULSD has lubricity additives put in it to make up for the loss up the sulfur.
