Let’s explain all of those confusing numbers, letters and terms to help you choose the right oil for your car.

However, if your car normally requires the use of 5W-20, it's dangerously low on oil, the only motor oil you have available ...

It's acceptable to use 0W-20 engine oil in place of 5W-20 or even 10W-20, since the number preceding the W refers to its ...