What oil is everyone using for your speed6? Just triing to get some idea's from some owners with higher miles. I'm on my second oil change( the first one was free from the dealer) and Im just looking for some advice. I know oil is all like pepsi verse coke its all in what you like better. I think there are some better oils out there. Have you heard any knocking or pinging with any one oil or have you found something that makes the car feel like its running better?