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why your oil preasure comes on when warmwell if the light comes on when its warm then it usually means that the bearings in the motor are getting worn, my Chevy is the same way the preasure goes all the way to 75 when i first start it but the drops to 10 when idling, i changed my oil to 20 w 50 and it stays at 40 or 50 then goes to 75 and higher when reving. your problem is normal just keep heavy oil in it.
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