OK Dayton Ohio. my brother lives in Kettering by the NCR course. The oil pressure gauge is not designed for synthetic (and I bet your owners manual doesn't call for synthetic). I had the same problem on my 300TE, the oil pressure gauge was not looking good. I went and had the oil changed to Castrol 20-40 and goddamn! pressure gauge went right back to where is should be, low and behold, the idiot who I bought the car from had put synthetic in it. Everything is fine now, I am convinced that the indicator gauge was confused because of the junk synthetic stuff. I am sure of this fact.....bet that's it...just go have the oil changed (all 7 quarts of it) back to mineral oil...bet the gauge comes back up....