Oil pressure problems

Tiny
JOLETA REED
  • MEMBER
  • 1998 ISUZU HOMBRE
  • 4 CYL
  • 2WD
  • MANUAL
  • 200,000 MILES
Oil pressure is real high when first started and after it warms up it drops real low at idle and fluctuates with throttle speed. It runs good and does not knock and does not use any oil
Saturday, June 3rd, 2017 AT 9:04 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,321 POSTS
Define "real low"
Normal oil pressure will be high when you first start the engine because the oil is thicker while cold. As the oil warms up it will flow easier and thin out. Thus you get a much lower pressure when the engine is warm. The faster the engine turns the higher the oil pressure will be, because the oil pump turns faster at higher rpm. This is why the oil pressure varies with throttle input.

Basically what you describe is normal behavior, as long as the pressure at idle is around 15-20 psi you are okay. Normally you want to see about 7-10 psi for every 1000 rpm.
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Saturday, June 3rd, 2017 AT 12:06 PM

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