Skip the auto shop - Our mechanics make house calls

Q: why does oil pressure gauge go up and down with rpm of engine?

asked by on

oil pressure gauge started fluctuating the other day.. usually rides at 30lbs now goes from 30 to 60 with the rpm's of the engine.. why?

My car has 250000 miles.
My car has an automatic transmission.

A: This is normal operation for your oil press...

This is normal operation for your oil pressure. The faster the motor spins, (RPM, revolutions per minute) the faster the oil pump spins creating higher oil pressure. Keep in mind, most gauges aren’t accurate. The only way to get an accurate reading is with a quality oil pressure tester.

You will need to remove the oil pressure sending unit and screw this gauge in there. Start the truck and see what the gauge says. If you are really interested, tape the gauge to the windshield and drive around and watch the what the gauge does. Keep in mind, if you want to tape it to your windshield, you will need a longer than normal hose to reach the windshield. I have had to do this on a number of occasions with odd oil pressure symptoms.

To reiterate, a rise in oil pressure with higher RPM’s is normal.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Gear shifter stuck

Most of the time, when a gear shifter gets stuck in position, it is the fault of the shift lock actuator. This actuator allows movement of the shifter only when the brake pedal has been depressed. If this actuator has...

Q: Starting issues when engine warms up

Hello there, thank you for asking about your 1990 Oldsmobile Cutlass Calais. Your symptoms are very similar to a vehicle experiencing a problem with the intake air temperature sensor. Other reasons for such a hard start can be low fuel...

Q: None of my electrical components are working

Hi, thanks for writing in. If nothing operates, the circuit is not complete. What you want to do is select one of the non-working circuits and simply trace the circuit until you find the open. Inasmuch as nothing works, you...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.