My06 9-5 2.3. Have changed pcv system, oil pump and cover. Thought it was a pressure problem but just replaced the seal and it leaked at idle after pressure build up. Also replaced the harmonic balancer. The car is running great at 220k miles and only leaves a small spot on driveway. Oil does cover engine while driving. Is there anything that will cause oil pressure to be high at the seal like oil regulator or passages restricted. Does not use a lot of oil but is messy. Thanks for any recommendations. The last seal was a National brand.