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1998 Jeep Cherokee Low Oil pressure

Tiny
2CP-ARCHIVES
  • MEMBER
  • 1998 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 37,000 MILES
1998 Jeep Cherokee mileage: 37,000. Low Oil pressure. When the engine is cold, the oil pressure is between 40-50 psi. However, after driving on the interstate for about 30-40 miles, the oil pressure drops to between 20-30 psi, and about 9 psi at idle. I use 10W-30 Pennzoil. I don't think there are enough miles on the engine for the pump/bearings to be worn, and I change the oil every 5000 miles. I am going to replace the sending unit, just to see if it makes a difference, any suggestions would be appreciated.
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Friday, December 10th, 2010 AT 7:14 PM

1 Reply

Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
The oil pressure is on the low side when the engine is warm, however nothing to get alarmed about. Try changing to a 20/50 for the summer and see if that does not help. It is also possible that your pressure gauge may not be calibrated correctly. You might want to verify it with another mechanical gauge.
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Friday, December 10th, 2010 AT 7:17 PM

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