I believe i put more than 4000 miles on this oil change. The change oil light came on first. Then i seemed to have a small oil leak from somewhere so i had to add oil periodically. I did not change the oil. The the low oil pressure light came and the alarm was sounding. I found the oil filter to be loose. So i tightened it. Still have the low pressure oil light on and alarm still sounding with oil to the full line.
Could be one of several issues. You may want to add a thicker oil which may help when the vehicle is hot after long runs. There is a product out there called: "Lucas", may want to add per specifications.
If changing oil viscosity does not help, may want to perform a compression test which may indicate worn pistons rings. Based on year, you may have lots of miles and worn internal parts. While driving, do you see smoke coming out of the tail pipe ?
Do you see any other leaks in the engine compartment ? If too dirty, may want to steam clean or use any after market products to clean your engine so that you can check for leaks.
Unfortunately, it sounds like your problem is one of the following, either:
A) A weak or failing oil pump which should be replaced immediately to avoid serious engine damage.
Or
B) A bad oil pressure sensor.
I would recommend having the vehicles electronic codes read, AutoZone will do this for free if you ask them. This should help you determine if the sensor is the problem or the pump.
SOURCE: 2002 Pontiac Grand Prix is loosing coolant and
Try getting your local mechanic to pressure test it. The can pump up the system and check for leaks.
Also the head gasket might have a minor leak. It may only leak once engine cools, the head shrinks and then water leaks out
SOURCE: oil light is on intermitantly.
THE OIL PRESSURE SENDING UNIT IS LOCATED UNDERNEATH THE EXHAUST MANAFOLD IT WILL BE THE ONE CLOSER TO TRANS.
How to Reset the CHANGE ENGINE OIL Message
1. With the ignition key in RUN but the engine off,
fully push and release the accelerator pedal slowly
three times within five seconds.
2. Turn the key to OFF.
If the CHANGE ENGINE OIL message comes
back on, the engine oil life monitor has not reset.
Repeat the procedure.
You can also download a PDF version of your owner's manual for free.
2000 Pontiac Montana Owner's Manual
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