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When I had the 190E 2.6, it always had lower hot oil pressure when using synthetic than dino. It would run right down to .3-.5bar when hot. All my MB's have done this, and all of them seemed to drop a little lower when using synthetic. Also, lower hot pressure was more likely when using lower numerical viscosity oil.
Does it go to 3bar under acceleration?
Does it consume oil?
A spun main bearing might be the culprit, but I wouldn't do a bottom end on the engine just yet.
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