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 ...

or weight, of the oil your engine requires. In the late 1970s, when I first started working on cars and doing engine ...

like 0W-20 and 5W-30, we'd have to use different weight oils for various climates. If you lived in the middle of the United States, you would often use a different weight engine oil in the summer ...