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karrs2fix, ASE Certified Technician
Category: Car
Satisfied Customers: 893
Experience:  master technician,L1 certified,Tech net training,16 years experience
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2002 Olds Bravada- Oil pressure is normal at start-up (40)

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2002 Olds Bravada- Oil pressure is normal at start-up (40) and initial driving (above 40) but after highway or running for about 20 min. oil pressure drops when car returns to idle. Pressure drops on gauge which triggers Check Gauges light and LED states Oil Pressure Low and then Stop Engine. No knocking present and it returns to normal if RPM is above idle (800+). Engine shuts down hard when this problem occurs.
How many miles are on the engine?
Customer: replied 7 years ago.


Unless you can perform a manual oil pressure test to verify actual engine oil pressure to determine if there is a mechanical issue or is it an electrical issue. You may have to take it for a second opinion and have the manual oil pressure test done.
Customer: replied 7 years ago.
If it was mechanical, wouldn't the pressure be low or a problem when the car is started & warmed up to operating temperature? Also, can oil viscosity be the problem? I had the oil changed after moving to Chicago from Las Vegas- 10W30 to 5W30.
You can have oil pressure loss after extended running and with the expansion of the metals and journals where the oil travels , viscosity can affect it but that is the right weight for your application. the 5w and 10w are the winter weights (viscosity when cold) 30 is the overall viscosity.
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