I don't think changing the oil is a maintenance item requiring a mechanic and a $30k computer. I change my oil on all my previous cars, and do almost all my own maintenance. When I don't have the tools, time, or technical savvy then I hand it off to the pros. I usually get ripped off, and don't like it. I am a mechanic and have turned wrenches professionally on both airplanes and boats.
If the Mas needs tech savy, for $1000 or $20,000 I'll hand it over to someone I feel I can trust. But $1000 for a $129 oil change is absurd. $400 is hard to swallow, but I did it anyway as I didn't have the time, and spending the money for the convenience was an easy choice.
I don't really believe my trade in value will be less if I take it to a third-party Euro-car specialist, or do it myself versus taking it to the dealer. It doesn't take a mechanic to change brakes either. On the other hand, I wouldn't recommend trying to do a front end alignment in one's garage, either. (Done it -- many years ago)
Also, in my home state of Alaska, there are no dealers and no third-party specialists. So, if I take it home, I get to change the oil myself anyway and drive around with the service reminder on every drive.
So, just trying to share info on what works on the Mas, as I had difficulty finding a tool that would work.