Lets include all the 129 series.

1) I have heard that the 300SL has had head gasket problems

2) The 600 has ignition harness problems (due to excess heat)

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Regards
Vince Alfonso (in Hong Kong)

92 MB 600 SEL
94 MB 600 SL
92 MB 500 SL (for sale)
93 BMW 740i