Excuse me, David. But I just gotta make an observation and ask, if I want to be honest with my reactions.
I've been actively participating in this forum for about 1.5 yrs-first under my former screen name, and now (with an employment change) with my current.
I could be a bit wrong. But it seems to me that you have an issue with your car (C280, no?) on average every 2-3 days. Consistently. Are you just (excuse me) a perfectionist, do you drive your car hard, or is your car about the most trouble-prone Benz I have ever come across?