pressure

I have a 2000 GMC Sierra SLE Z71, 217,000 Miles. The truck sat for about 8 months and yesterday I renewed the tags and changed the oil. The truck had normally ran between 40-45 on the OP Gauge, now it's idling on 45-50 and now at 40mph it's about 60. I don't remember it being this high...

About 8 months ago my oil pressure gauge messed up and instead of the needle being in the numbers, it is all the way off to the right of the gauge. Two days ago, that gauge started bouncing from one position to another and finally my oil pressure low light "DINGED" at me and gave an alert...

Hello! I have a 2000 Sierra with 250000 KM's on it. Last winter I had no oil pressure and cream color engine oil. I brought it to a shop and they ended up tearing down the engine to get to the head gasket and heads. What they found was the heads were warped. So they got them milled down...