This morning, I noticed my 85 300D (A1 condition) was idling funny. The Tach stayed constant while the oil pressure guage fluctuated between 2 and 2.5. I a little concerned with this, for I believe my car to be in top tune... What can be wrong. I got a valve adjustment 6k ago, I use DFC and my car only has 138k. New valve seals, new head gasket, motor mounts, and many other new parts, including the alternator. Any insight would be appreciated. (BTW, I did a search and got a bunch of 420SEL problems... Last I checked I have less of a motor than that!) Thanks!