Anyone remotely familiar with diesel engines understands the importance of oil and coolant, as they are the lifeblood of the powerplant. Oil lubricates, water cools—and one without the other typically ...

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 ...