My friend is having major work done on his 1990 420SEL because he didn't replace the timing chain. He said it should be done every 75,000 miles. Is this true? I just bought a 1990 300SEL with 88,000 miles. I'm not sure if the chain was ever done. Should I have it replaced so I don't go through what my friend is? Any information would appreciated.
Yes, it should be done. 75,000 miles seems a bit too frequent; most are done every 100k miles.
I asked that question myself having recently owned several W126's; According to my expert Mercedes mechanic yo are fine until you start hearing a clickity clak sound that resembles a train on the tracks....that's the early warning.
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