Echoing what others have said here. Stick with a trusted oil recommended by MB (Mobil 1 0W-40 for the most part) and 91 or better octane for the gas. Your car will thank you. You are welcome of course to use "dino" oil and 89/87/85 octane in your car as some have suggested, but you may not like the long term results. I for one have stuck with Mobil 1 0W-40 and 91 or better for gas for all of my Crossfires that I have owned and I have yet to have any issues with the engine.