hey, i don't know if this sounds a little crazy but this will be my first oil change on my 2000 ml 320, performed by me and i have no idea what oil and filter to use. I heard that i can go with mobil 1 0-40 and i know i can get an oil filter at advance auto made by purelator. So , would that be safe to do or do i need to buy it from the dealer. Also i am not sure how much oil the engine takes. If anyone could help me on this i would appreciate it very much. thanks a lot