I have never changed the tranny fluid or the supercharger oil. The PS pump is getting a little noisey. I've got spare crank and cam position sensors, which is probably why they haven't failed yet. Did have a MAF sensor go at about 90K miles. Rear door locks just stopped working.

I've had Fords and never had the electrical issues I have with Benzes. Most of the time they are just annoying things, like window or seat switches. Sometimes they stop the car dead like fuel pump relays or that stupid relay assembly under the hood. I am also surprised how the dealer is unable to diagnose failures. When the stupid fuel tank pressure sensors went a I had to tell them what the problem was.

Don't get me wrong, I'd rather drive my MBs than anything else, and every brand has their issues. But, I am often surprised at the stuff that they could have done better.