I have a 414A with RAM IV conversion. Just completed annual after major avionics upgrade (G600, JPI 960, WAAS 430s etc) have always had lower oil pressure on left engine, only barely coming into the green on run up, take off and cruise. the right engine is perfect with 50-60 psi at all phases of flight. The left engine also seems to run hotter with CHT but oil temps is stable and equal. I have never felt comfortable with it and contantly worry that I am slowly damaging the egine to cost more for overhaul than needed or worse - suffer a lost cylendar in flight.

The mechanic has adjusted a "screw" and even replaced it - no change. Now after about 6 mos of down time and after annual it is lower and basically will hardly enter into the green. We finally discussed changing the oil pump. It is external- on the back of the engine. Thoughts of any with experience is greatly appreciated?