Perhaps this is the same noise that I hear from my 4.5 in the SEL?? I DO see some scoring on the most visible part of the cam with the oil cap off. and a ticking that I could swear was an exhaust leak, but can't pinpoint it yet.

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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