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If you need a spare OPRV to test with I've got one that you can borrow for shipping costs - just PM me your address. The other thing I would check if I were you is the oil cooler thermostat. Easy to get to like the OPRV. Just fixed oil pressure issues on my car where this thing was no good and I've got an 87 951 with approx 130k as well.
Thanks I really appreciate it. I might take you up on this. I just went and looked, 400 dollars for a new one! Christ! I just ordered new o-rings and a washer and will try cleaning the existing one.
This just unscrews from the oil cooler correct? I did the job on my old 84 944 back in the day but I can't remember for the life of me where the OPRV was located on the oil cooler.