Can i mix 5w30 with 10w30 engine oil in a Volvo?

Yes, you can mix 5W-30 and 10W-30 engine oils in your Volvo without causing immediate harm. Both oils have the same high-temperature viscosity, but the 5W-30 will perform better in colder conditions due to its lower winter rating. However, it's generally recommended to stick to one type of oil for optimal performance and protection, so consider using the same oil grade for future oil changes. Always check your owner's manual for the manufacturer's recommended oil specifications.