Motor oil is the lifeblood of a car's engine. It keeps all those little components lubricated to keep the engine running smoothly and quietly. Most car owners know how important it is to change motor ...

Modern engine oil does more than lubricate internal parts. It absorbs heat from the pistons and cylinder walls, working in conjunction with the cooling system to maintain the engine at the required ...

Diesel and gasoline engines might look alike under the hood, but they use oil in very different ways. Gas engines run cleaner, but diesels create much more soot, crank out higher compression forces, ...