I was running Mobil 1 15w50 oil, at idle when cool it was fine(40+lbs.) but after about a 20 min. run session it would only be like 45 at a rev and lugging around the pits it would be less than 20 and some times the pro light would flicker. also in one real tight 2nd gear turn the light would flicker. most of the guys w/ the faster cars said they had the same and it was ok, just add an Accusump.