Question about 1998 Chevrolet Malibu

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Oil Pressure Light Comes On after 10 min of Driving

I have a similar problem. After changing the oil and filter on my 1997 Malibu, my oil pressure light comes on after driving for 10 min and then slowing to idle (600 RPM). If I rev the engine to 1000 RPM while stopped, the light goes off. After about 40 minutes of driving, the light does not come on again ...even at idle.

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  • quinnjsm Sep 14, 2009

    I have been using 10/30w when I change my oil and that is what I used this time as well. Yesterday I changed the oil again and went with 10/40w and it seems the problem is a little worse. This morning the oil pressure light went on a little earlier and it seemed I had to rev the RPMs a little over 1000. Maybe it is a clogged pickup screen... Any ideas?

  • quinnjsm Sep 14, 2009

    Last week I replaced the oil pressure sensor with a new one and the problem was exactly the same... so I would think that eliminates that one. I did check the oil using the oil dipstick and it is in the range above 'add' and just below 'full'.

  • Anonymous Mar 13, 2014

    after driving for about 30 mins the oil light will come on when braking or when idling but goes off when driving again

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You may not have put the right amount of oil in your car, your oil pressure sensor could be faulty, or you may have a leak.

By revving your engine, you're increasing the pressure and thus turning off the light and making the sensor think that it's at the correct pressure.

Posted on Sep 08, 2009

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You may have a bad oil level sensor that will work properlu after the car is warm,have it check or replaced (to replace you need to drain the oil and its located on the bottom of the oil pan or the side(back to the rear) un plug the harness connector and unscrew the retaining bolt then with a pair of pliers slowly pull out with a side to side motion.

Posted on Sep 08, 2009

  • marcial adorno
    marcial adorno Sep 14, 2009

    if you have done all this then the oil pump is the last culprit,have your car checked for oil pressure when first startyed and then after is hot,there may be an internal leak that goes away after the system gets hot(the metal expands)

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It sound like you used the wrong waight in the oil its probly to thin try a thiker one should solve the problem
example 5/10w > 10/30w

Posted on Sep 08, 2009

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1 Answer

My oil light comes on after higher speeds while idling at a traffic light.


It may be your oil pressure transmitter switch at fault. There's many different oil pressure transmitter switches. Here are some generic images:
oil pressure transmitter switch Google Search
It could also be that your vehicle is due an oil/filter change.
Is your oil level ok?

It's unlikely to be your oil pump at fault.
  1. Check your oil level
  2. Is the vehicle due an oil/filter change?
The oil pressure transmitter switch simply tells the engine 'low oil pressure'. This usually happens at idling speed due to a faulty transmitter switch, low oil level or there's a need for an oil change as the old oil is no longer up to the job. Oil pressure switches are easily changed.

The important thing is that you aren't getting a warning light when driving at speed. If your oil level is okay and it isn't due an oil/filter change - it probably is the oil pressure switch at fault.

For your own peace of mind try adding an oil additive.


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