Mobil 1 Annual Protection is a motor oil that’s designed to last a full year, or 20,000 miles. It’s available in 0W-20, 5W-20, and 5W-30 viscosity grades. In this video we’ll be answering three ...

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 ...