Motor oil comes in various weights, including 5W-30 and 10W-30. But can you substitute one for the other in your car? Here's what you need to know.

Title says it all:What's the difference between 5w-30, 10w-30, and SAE 30?They're all 30 weight motor oils, but how do they differ? What are the advantages and disadvantages of each?

AMSOIL SAE 0W-40 Signature Series Synthetic Motor Oil Available at: Find locations through amsoil.com Price: $11.50 (U.S.) 10W-30, 5W-20 or even 0W-40. Picking the right viscosity for your engine ...

10W-30 and 5W-30 are interchangeable in hot climates, as they are identical once warm. However, owners should stick to the recommended oil in cold weather.