I just ordered up a case of Motul 10w40 http://www.performanceoilstore.com/p...sp?prod=369811 at $8 a quart it's a little pricy but Mercedes Benz recommends it. I found that mobil1 oil is kinda funky IMO.

Last time I changed the oil and poured in fresh Mobil1 I looked in the bottom of the oil container and all I saw was a brownish sludge. Definitely not worth the $6/quart for such garbage.