Product Description Motor oil is a lubricant used in internal combustion engines, which power cars, motorcycles, lawnmowers, engine-generators, and many other machines. In engines, there are parts which move against each other, and the friction between the parts wastes...
which makes for a lot of oil consumption in the U.S. That level of consumption has spawned a large market for motor oil. The one thing all oils have in common is that they are SAE graded, but even that trait is sometimes a mystery. ...