Engine oil and coolant are the interrelated lifeblood of the 6.0L Power Stroke, and if a clot should form or the fluids become mixed, serious internal trauma is likely. Like most diesel engines, the 6 ...

Most internal combustion engines rely on motor oil for one reason: lubrication. The oil gets pressurized between 10-70 psi and spends most of its life subjected to roughly 200 degrees’ worth of heat.

Diesel engines, for all their rugged usefulness, can be tremendously polluting. They produce more NOx -- nitrogen oxides-based emissions -- than gasoline-fed cars, as well as more particulates, aka ...