Pontiac Bonneville

97 pontiac bonneville oil pressure when warmed up?

I have a Pontiac Bonneville 97. when I start the engine pressure End util oil is heated and then the needle drops. It doesn't go all the way into the red it fluctuates just above idle. Would replacing the PCV valve and put a thicker grade of oil do anygood? Or maybe the oil pressure switch defective? And yes I checked the oil level its been completely FULL!

High mileage cars usually have the engine wear that produces less oil pressure when warmed up. You could have checked the pressure in a store with a manometer good mechanical strength drawn from the oil switch port to ensure it is not a unit or sending the wrong Meter Dash --- they had problems with these units. Could simply be the motor bearings wear or pump. I recommend switching to a grade of oil heavy as 10W-40, 15W-40 or perhaps 40 or 20W-50 --- you might have to play a bit to get good quality oil to pressure and up --- I also recommend that you add a product to change oil every 3,000 miles engine oil supplement called EOS or which can be found to most GM dealers parts dept's --- it's a much better product than most oil additives and has been developed by GM engineers for superior lubrication. Remember that adding thicker oil will make your gas mileage to decline a little and can be very hard to start engine in cold weather.

Vintage AMT 1962 Pontiac Bonneville Sport Coupe 1 25 Scale Build
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