I'm going to answer in a run on sentence just like your post I read that if you 1 PSI of oil pressure per 100 rpm you're ok even though that seems low to me but that's what I read I know my engine fully warmed up at 650 rpm idle can dip as low as about 15 PSI sometimes usually 20 but is around 40-50 cruising if you're not getting any funny noises from the engine I would question whether the reading is accurate and like Josh said it doesn't seem like oil pumps fail that often hope this helps! oh and I tried 10W30 once (using 5W30 now) and it went up a little when cold but that's about it and remember flow lubricates not pressure
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