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

This decomposition takes place even faster when the engine is exposed to extreme conditions, which reduces the oil's ability ...

While conventional oil typically needs to be replaced every 3,000 to 5,000 miles, synthetic oil can often last up to 10,000 miles or more, depending on your car and driving habits.

“As engine technology and fuel technology have evolved, the environment in the crankcase has changed,” says Stede Granger, Shell Lubricants ... an SAE 40 oil. That is a fully synthetic ...