It's definitely been a while since I've updated. Both cars are doing great. The C300 barely needs any maintenance, it's been a great car. The SL500 has needed a few things done.
1) There have been issues starting the car for at least a year. When you turn the key, it didn't always start; it would just make clicking sounds. If you kept trying, it would eventually work. My friend Bud had showed me that sometimes a fuel pressure regulator can cause this. Sure enough, it was bad so I had it replaced. The problem went away for a bit but came back. I did a lot of research and thought it might be a crankshaft position sensor, which seems to be a common issue on the M113 SLs... but those usually fail when it's hot outside and temperature didn't make a difference in my case. I brought it to my friend Bud's shop and he found out it was a bad fuel pump; problem solved!
2) Replaced front brakes.
3) The
Michelin Pilot Sport 2's I got back in April 2009 finally wore out. I put almost 30k miles on them which is pretty good for staggered performance tires. PS2s weren't available this time, so I went with Pilot Sport A/S Plus. They're not as soft and it's noticeable... but they were also 300 dollars cheaper.
4) Even after the work done on the panoramic roof, I was still having fitment issues. I brought the roof into Mercedes-Benz of Chandler and had them run through the "Glass roof adjustment procedure" (on the service DVD, it's 77-430). It fits great now; no noise and no water leakage when going through the car wash.
5) The doors used to lock when you got the car moving. For some reason that stopped happening. I did a lot of searching and then fellow BenzWorld member
RKH described a procedure that's in the owner's manual. You get in the car, turn it on, and close the doors. If you hold down the lock button for 5 seconds, it'll enable the auto-lock feature. If you hold down the unlock button for 5 seconds, it disables the auto-lock feature. It got disabled somehow and sure enough, holding it for for 5 seconds fixed it right up.
6) Something inside the rear view mirror broke and it became wobbly and almost unusable. I pulled it off, took it apart and noticed some plastic bits were broken. It took me a while, but I found a solution.
http://www.brianclifton.com/blogs/cars/r129-fixing-rear-view-mirror
It's been hot here in Arizona this summer. When it gets to be around 120 degrees outside, having a black on black car with an all glass roof is a pain in the ass, but I still love the car.