High oil pressure goes to 60 when stopped 80 when stepping on the gas change oil every 2500 miles just changed oil last week should i us 5w30 i used 10w30 high mileage 1999 grand Cherokee?

Answer 1

Oil pressure should go up with engine load. It could go higher when cold when using a thicker oil. Depending on your climate you may want to stick with the 5w-30 as it is easier to move around the engine on start up. Here in WI I try to avoid 10w-30 as much as possible. If the readings are erradic and it happened right after an oil change I would check the wiring going to the oil pressure sensor. On the six cylinder the wiring harness for the sensor loops over or next to the oil filter. Easy way to check if there is a problem is have someone watch the guage while idling and jiggle the harness, if it the needle changes position or drops to zero than there is a problem.