JoeB - I am very delighted to share a common experience with our beloved W126 - but do tell me more of your experience and how changing a gas cap helped solve the problem (I am quite loathe to address this as a "problem" coz I believe its a minor dis-customisation - as I would like to think that owning a MB is acquiring part of a auto-history and thus there shouldnt in theory be any problems).

Was your gas cap really worn out? I don't think mine is.

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... Kerry

126 tailed by a 203, 129 leading the pack.