Question about 1998 Chevrolet Blazer

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While idling oil pressure is fine, once the engine warms up and in gear, oil pressure drops to 20

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Bad news. You are looking at replacing the crank and/or the rod bearings. They are worn. It is fine when the oil is cold and thick, but when the oil heats up it gets thinner and the gap in the bearing is too large to hold the pressure up. It will run like that for a long time but will get progressively worse until it is so low that you spin a bearing or you throw a rod. Just make sure that you keep the oil full, don't leave it idle any more than you need too, don't over rev it and try not to horse it. (don't make it work to hard) I have 289,000 and mine has been doing that for the last 70,000.

Posted on Sep 03, 2010

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3 Answers

Oil light on after engine warm-up on idle


this means a mechanical gauge test is required to check actual pressure warm idling if low below 20 psi then the oil pressure pump relief is stuck open or engine bearing are worn

May 15, 2014 | 2005 Opel Astra 1.4

1 Answer

Oil pump at idle is good when car is warming up, but after it get real warm after 20 miles of driving the idle oil presure is low about 15 lbs



  • This is normal. On your car, on a cold start the pressure will be around 75 PSI. After the engine warms an oil pressure of 15-20 PSI at idle is just what it should be. The oil pressure gauge should escalate when accelerating up a bit to. If your old school like me 15 PSI mean danger but tat Caddy is just fine.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.


Regards, Tony

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2001 camaro 3800 eng. when eng is cold oil pressure is high after warms up oil pressure drop very low at idle. why??


When the engine and oil are cold it will show a high pressure because of the viscosity of the oil. When it warms up the oil is thinner. If it doesn't drop below 20-25 psi at warm idle I wouldn't worry about it as that is normal.

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My oil pressure drops to zero while at idle once the engine warms up. Oil level is fine. WHY?


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Low oil pressure after engine warms up in 94 blazer with 4.3


I have a 99 blazer and ever since I have owned it, it reads lower in pressure when idling, but will go up too 40 while driving. This is normal for the vehicle. If the pressure gets real low, and stays low, it means its time for an oil change.

As long as the pressure goes up when you give it gas, it is fine.

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1 Answer

No oil pressure at idle once motor warm


Re-new the engine oil and see if the problem persists.
Low oil pressure at idle is usually a sign of a worn motor - worn camshaft and crank bearings allowing excessive oil to pass.

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Oil pressure guage drops after engine warms up


Is it possible that you are using a different brand or weight of oil? 10w30 instead of 10w40 could potentially cause this.


Can also be caused by engine running warmer for some reason.

3 psi shouldn't be much of a concern.

You can try a heavier weight oil if you want it to be a little higher.

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Low oil pressure at idle


how low does the oil pressure drop?? is it below 40?

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