Yes, you can 5W20 and 5W30 engine oils since they are both synthetic and can perform extremely well at different temperatures. However, in extreme weather conditions, you might face a few problems if you mix these oils.  In cold weather, 5W20 will thin out and in warmer weather conditions 5W30 will get thicker. To get … Continue reading Can I Mix 5w20 and 5w30? Choose the Right Engine Oil