Let’s explain all of those confusing numbers, letters and terms to help you choose the right oil for your car.
Motor oil comes in a variety of forms, designated by pairs of numbers, but the most common two are 10W-30 and 10W-40. What's ...
“As engine technology and fuel technology have evolved, the environment in the crankcase has changed,” says Stede Granger, Shell ... how SAE oil grades are defined (15W-40, 10W-30, 5W-40 ...
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