What's the 2006 volvo s40 oil type?

The recommended oil type on the 2006 Volvo S40 when operating under normal temperatures is SAE 5W-30. If it gets hotter than SAE 86F, then You should use SAE 10W-30. Make sure that when You purchase Your oil, the API certification is on the bottle. The purpose of engine oil is to lubricate and preserve the life of the engine and its components. It prevents overheating, reduces friction, and cleans its parts. In order to keep the motor healthy, it's important that You remember when Your vehicle is due for an oil change. Not only that but also remember, if You're driving Your vehicle daily, check the oil level too.