High Oil pressure after change
Thread Starter
Senior Member
Joined: Jan 2011
Posts: 645
Likes: 1
From: Dalton, MA
Year: 1998
Model: Cherokee
Engine: 4.0 H.O. 180K miles
After looking at the box of the fram xtend-guard filter i noticed it was intended for synthetic oil...
Being all wally world had in stock i had assumed it was just a standard filter. I'm running a Pure1 filter now and the pressure is back to normal.
Being all wally world had in stock i had assumed it was just a standard filter. I'm running a Pure1 filter now and the pressure is back to normal.
CF Veteran
Joined: Feb 2010
Posts: 12,367
Likes: 23
From: Oroville, CA
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
So I recently changed my oil, put 6 quarts of penzoil high mileage in with some STP additive. I made sure to drain as much of the old oil as possible, turning over the engine after the drips died down to flush some of the channels out. I've noticed that my oil pressure is normal idling and stays around 40-60 on the road most of the time, but going up the slightest hill my pressure will raise up to 80+ until i let off the gas. The oil level is between "add" and "safe" but i have a feeling that theres too much. Either that or the STP is messing with the pressure. Any thoughts?
CF Veteran

Joined: Oct 2010
Posts: 2,150
Likes: 12
From: Ontario, Canada
Year: 1989 Laredo
Model: Cherokee
Engine: 4.0 L 6 Renix
My Peep has 497000 pluss Km now and climbing, change the oil every 5 to 7 weeks (6000 km +/- 500 km) use penzoil, castrol, Qstate, valvoline 10W30, sometimes the HiMi type if on sale. I always use the base Fram brand filter and no filter problems. Based on pressure when driving and up to operating temp; always have about 5 to 10 psi better pressure when the oil is fresh. Drops to about 45psi when the oil is passed half life.
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