Morning all. Apologies if this has been asked/answered before and I just missed it but I need help! In brief, Mk3 GT6 initial oil pressure on start up/cold running is good and where I think it ought to be (cold idle about 60 psi), within 10 minutes of driving and at steady cruise, I notice the needle sweeping round the guage as the pressure drops. It gets down to about 15-20 psi with no real noticeable difference between idle and revs. I'm using a 20W50 oil currently. Am I just being a bit paranoid and this is acceptable? It just seems odd the way the guage drops, almost comically like the classic aircraft fuel guage in a cheap disaster movie! Any ideas?