I own a 1985 W123.133 300D turbo diesel car. The instrument cluster
shows a film of oil at the bottom where the various indicator lights
are. I suspect that the oil pressure gauge is leaking very slowly. I
don't know if oil is coming from the oil pressure line connection, or
the coiled Bourdon tube.
Has anyone observed this problem? If yes, what is the least cost fix?
Replace the entire temperature/fuel/pressure gauge assembly, or can i
actually repair a leaking Bourdon tube, assuming that the connection to
the oil filter is not leaking?
Regards / JCH