I have a 67 250SE whose interior labeling is in German. I assume the "OEL" Guage is either oil pressure or oil level? My issue is, when I start the car up, the oel guage shoots up to 3 which is the highest level. Only after considerable warming up and only during idle, it will fall close to 2. This stays the same even after an oil/oil filter change. Any ideas? Thanks.