Assuming she's thinking of a C-class, I had a 96 C200 which gave me loads of problems in the electronics wired around the engine. Some connection (they couldn't figure which one) was loose and the engine wobbled everytime it was started and sometimes it just wouldn't start. I was told that 96 was not a good year for the C200s. Perhaps its only a personal experience.
126 tailed by a 203, 129 leading the pack.