Both of mine run around .9 to 1.5 bars hot idle, while in gear at a stop. .9 bars for Mobil 5W-40 synthetic and 1.5 for Delvac 15W-40. I'm running Valvoline Synpower 5W-40 in one of them now and it seems to do around 1.5 at hot idle.

What oil are you running in yours?

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(2) 1988 300 SEL W126