Oil Types Archives

two jugs of Valvoline full synthetic motor oil sitting atop a red toolbox

Oil Viscosity Explained: 5w20 vs. 5w30 vs. 10w30

Ever wonder how what the numbers on oil jugs mean? Find out what you need to know.

What Engine Oil Should You Use in the Winter?

Wondering what kind of oil your car needs during the winter time? Check out this article to learn how winter effects motor oil.

what-do-different-oil-grades-mean-for-your-engine

Motor Oil: What Do Grades Mean For Your Engine?

An oil's grade, or weight is a measure of oil's viscosity, which is used to measure how well it flows. Learn more.

STP synthetic and conventional oils on the AutoZone parts counter

Is Synthetic Oil Worth It?

If you've never used synthetic oil, it might be time to make an upgrade. Learn about the advantages of synthetic oil and decide if it's time to upgrade.

High Mileage Motor Oil from AutoZone with STP oil filter

What is High Mileage Oil?

High mileage oil is pretty much what it sounds like, oil for engines with a lot of miles on the odometer—more than 75,000 miles to be exact.

Man looking at STP 5W-30 synthetic motor oil at an AutoZone store.

Synthetic Oil vs. Conventional Oil -- Which Is Better?

Both synthetic and conventional oil will protect your engine, but it all comes down to what is a better fit for your car. Here are a few tips from AutoZone to help you decide.