Engine oil is essential for cars with internal combustion engines. It lubricates the engine's internal parts, like the camshaft(s), crankshaft, and pistons, as well as helps with heat dissipation. But ...

The number preceding the "W" is the "winter weight". I'm not sure how they compute it, or what it stands for, but basically, a "5W-XX" can be pumped by your engine at a lower temperature than a ...