86 Wonder Wedge

Well, I did a number of things. I resealed the oil pump (and I think this was the main cause since the exterior was wet, and there were small brown "tracks" under the seals where it had been leaking), I used one extra washer under the pressure relief spring, and I installed a new pressure sender from BWD. And I still run a 5W-30 HM oil.

I now get 50-55 when cold, 45-50 when cruising, and 30-35 at idle.