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 ...

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 ...

Used to be that, back in the day, you'd top up with 10W-30 or the old reliable ... better and more efficient engine designs, and smarter chemistry underpinning motor oil production.