Oil Pressure fluctuate's - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-01-2009, 09:54 AM   #11
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That level will change depending on if the car is hot or cold.
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Old 05-01-2009, 09:59 AM   #12
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Color looks fine. LOL The level of the reservoir goes up and down with operation. As long as it isnt staying low when engine is cold, that is fine. If you notice you have to keep adding and it'* remains low, then you have a concern. Color isnt a factor in green antifreeze. Well, unless it turns brown from oil contamination. The orange Dexcool is the one that needs to be watched. When it go red, its wearing out and oxidizing and eating things. This is for older Dex. It has been reformulated. You have green already so stay greeen, the two dont mix.
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Old 05-01-2009, 10:00 AM   #13
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yike'* almost had me going back to my old habbits for a min. i thought it was VW..lol
I figured that'* what it was. But i was not sure and wanted to put every thing out there so i can get this Oil Pressure problem solved! Also what do you guy think about the color in the reserve/overflow tank? that dont look like green antifreeze to me?

P.*.

Thanks every one so far for the help! i can tell i will be a member of this site for awile to come!

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Old 05-01-2009, 10:04 AM   #14
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Let'* take this one part at a time.

Oil Pressure: (Please, never put anything as thick as 20-50 in your car, the oil pump was not designed to handle that thick of a viscosity)

The gauge cluster found in the 92-99 years are extremely poor for accuracy overall. Not only for oil pressure, but all readings in general.
The sender, if the sender has lost a seal internally it can malfunction. The typcial failure is to read at max pressure, it has been found in a couple cases to show low pressure.

The best suggestion and only way to know for sure is to have a mechanical gauge used to check pressure.

And to let you know how poor the gauges/senders can be, I've gone through senders from Napa, Advance Auto and AutoZone w/o any luck on stabilizing my readings. I have a high oil pressure kit along with a long list of mods on the engine. Yet one moment my gauge reads 80 psi and then it might read 30 or 40. At times you can watch it move while keeping the rpm constant.

Coolant level and UIM failures:
The mark on your coolant bottle means nothing except a different temperature of the fluid and a slight change in the level of the radiator. If you note a decreasing amount day after day, there is an issue. That slight amount isn't enough to indicate anything out of the oridinary. Color only means you have a future hour of cleaning a res tank and refilling with nice clean coolant.
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Old 05-01-2009, 10:04 AM   #15
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I'm going to say it again. Get teh pressure tested. You can't always trust the sensor. Personally I would change the sensor.
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Old 05-01-2009, 10:21 AM   #16
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I agree Dan.

Although, after having spent abotu $100 in sensors w/o change...I'd spend on the mechanical gauge test and decide if the sensor is worthwhile or not.

My sensor is not the issue and therefore as long as pressure reads on my gauge, I know there'* pressure and it'* consistent.
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Old 05-01-2009, 10:28 AM   #17
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I will get it tested today! and post pictures and results Thanks again
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Old 05-01-2009, 10:30 AM   #18
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The most important thing is testing when it'* up to temp and idling. That will show what your worst case oil pressure is.
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Old 05-01-2009, 08:00 PM   #19
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Already!! Just left my mechanics he'* saying it is the oil sending unit? any suggestions?
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Old 05-01-2009, 09:43 PM   #20
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Replace it. It'* not that hard to do.
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