Guys- First off I HATE creating threads with topics that have been beaten to death but O hve searched for over an hour and have read it all. LOL I want to know what you are running. I have seen the 0-40W issues with foaming in the intake, to the fact that in 2010 they changed the recommendation to 5-40W but some old oil caps were installed. LOL I have a Kenne Bell setup and want to do my first oil change. I am an Amsoil preferred customer so I have that option but not sure I want to run a European Car Formula 5W-40 Synthetic Motor Oil. Or do I just go with Mobil 1 0W-40 ??? Any positive feedback would be nice.