So while we are at it I change my own too. MB says 229.51 spec oil so I am using Mobil 1 ESP formula M (which is what is used by the factory). It is apparently made from the breast milk of mermaids making it expensive....and it uses 13 quarts. I wait for a sale to buy it and I can get it for as low as $6/quart. I use OE filters I get on line. Change interval is every 10K and I have a Fumoto valve which makes it easier...especially with the about of oil coming out. It is super easy. The filter (replaceable element type) is up on top of the motor in the front. Drain oil goes to the auto parts store. I used to work (in my previous life) at an independent VW/Porsche/Audi shop and am very particular as to who works on my vehicles having seen the work of some of the chains.