How to Choose the Right Engine Oil for Your Car

The right engine oil keeps your engine cool, clean and protected. The wrong grade can cost you fuel economy and engine life.

Read the viscosity grade

A grade like 5W-30 tells you how the oil flows when cold (the number before the W) and at operating temperature. Always match the grade your manufacturer specifies in the owner’s manual.

Synthetic vs mineral

• Full synthetic — best protection, longer drain intervals, ideal for modern engines.
• Semi-synthetic — a good balance of price and protection.
• Mineral — budget option for older engines.

Browse genuine engine oils for your make and model on AmarParts.