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Old 05-02-2014, 10:34 PM
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Oil Pressure Meter

Hey all,

I havent driven my JGC for about 5 days and today when I was driving it, I noticed the oil pressure was around 70 - 80, which is about half way on the meter) and I noticed the more I press on the gas the higher the pressure would go. Is this bad? This is the first time i've noticed the oil pressure higher than 34 where is it usually at.

Also it has been about 1,000 miles since I took it in for the first oil change at Fitzgerald Chrysler Jeep.

Thanks.
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Old 05-02-2014, 11:10 PM
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Re: Oil Pressure Meter

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Originally Posted by makris0000 View Post
Hey all,

I havent driven my JGC for about 5 days and today when I was driving it, I noticed the oil pressure was around 70 - 80, which is about half way on the meter) and I noticed the more I press on the gas the higher the pressure would go. Is this bad? This is the first time i've noticed the oil pressure higher than 34 where is it usually at.

Also it has been about 1,000 miles since I took it in for the first oil change at Fitzgerald Chrysler Jeep.

Thanks.
That's normal. As the vehicle warms up, it should drop, probably to the 30's. My V6 will often start in the 90's when it's cold and then slowly drop off. My Miata does the same thing and it has a real gauge instead of the virtual one like on the GC.

I've been driving cars with oil pressure gauges for over 50 years now and that is what oil does as it warms up.
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Old 05-03-2014, 08:59 AM
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Re: Oil Pressure Meter

Ok thanks. This is only my second car and my first one didn't have an oil pressure gauge.
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Old 05-03-2014, 09:16 AM
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Re: Oil Pressure Meter

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Originally Posted by makris0000 View Post
Ok thanks. This is only my second car and my first one didn't have an oil pressure gauge.
I thought I replied to this, but I don't know where it went.

One of the reasons that manufacturers have tended to do away with the oil pressure gauge is that pressures change a lot depending upon engine temperature and speed. It's easier to use an idiot light than to educate the driver. The problem with the idiot light is that, by the time it comes on, the damage is probably done. If you pressure drops below the 30's while driving at normal speed, you probably should have things checked out ASAP.

This is also why the manufacturers put dampened temperature gauges in cars. A true reading engine temperature gauge would also vary a fair amount during normal driving, even if the thermostat is working properly. So the "normal" position usually covers a wide temperature range before it starts indicating hot or cold.
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Old 05-03-2014, 09:48 AM
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Re: Oil Pressure Meter

the 3.6L uses a variable displacement oil pump for 2 stage pressure regulation.

from FSM:
The engine oil pump features seven vanes and a moving element that continuously adjusts to maintain a regulated oil pressure supply by varying the displacement of the pump. The pump has two regulated pressure stages of operation controlled by an on/off solenoid. Low pressure mode regulation (solenoid on) is approximately 200 kPa (29 psi) and high pressure mode regulation (solenoid off) is approximately 450 kPa (65 psi). The Powertrain Control Module (PCM) switches the pump between stages based on engine operating conditions, oil and coolant temperatures, speed and load. Under most typical conditions, the pump will run in low mode from idle up to around 3000 rpm, and switch from low to high mode between 3000 and 4000 rpm.
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