In the late 1970s, when I first started working on cars and doing engine maintenance, 10W-30 was about the only ...

One way to do that is by using a low viscosity oil. The less energy an engine uses to lubricate itself, the less gas it uses in the process. There's also the fact that as engine technologies and ...

In the past, there have been similar shifts in preferred engine oil viscosity grades. An example is the transition in heavy duty diesel engine oils in the 1980s from monograde viscosity SAE 30 and ...