I've got a 300SE (W126) that runs around 60c also, and my tech says not to worry. It's been like that since I've had it which is 4 years and close to 60K miles.

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Marc Galassini

'93 300CE 38K Sold
'89 560SL 19K Sold
'91 300SE 191K Totalled 11/6/08
'90 300SE 90K