My owners manual says that if the engine is good and hot, after a hard run, etc, anything down to 0.3 bar is acceptable at idle.
I've never seen one of these cars that didn't peg the gauge at road speed.
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~Michael S.~
Past cars:
1986 300SDL
1987 300SDL
1982 240D
1982 300SD
Current:
1987 300SDL
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