For the early 90's 6 cilinder engines the book says at least 100 PSI. At 130 you have a poor-decent compression. My opinion. Around 150 I would say decent, over 160 good/great. I have seen for early 90's engines 125 PSI and 185. Before head gasket replacement, valve job and resurfacing it was 125. M50 engine if I recall correctly.
JOY = BMW
Last edited by joyism5; 12-27-2012 at 02:56 PM.