OIL PRESSURE FLUCTUATION - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-06-2005, 09:30 AM   #1
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Default OIL PRESSURE FLUCTUATION

Can NE1 tell me why my oil pressure will be at approximately 40 right after starting, but within 5 minutes will then dip below 10 (in the red!!!) every time I stop accelerating???
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Old 07-06-2005, 09:58 AM   #2
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What is your year and trim level? Also, how many miles are on the engine?

Would be a good idea to add all that information into your signature.
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Old 07-06-2005, 09:59 AM   #3
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Before we go too crazy trying to diagnose this, when was the last oil change and is the oil at the correct level?

My 97 did a similar thing and it was merely an oil change cause previous owner was 2K over on a dino juice change when I got the car.
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Old 07-06-2005, 10:20 AM   #4
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Okay. I am a new Bonnie owner, and new to this site, so forgive me if I go astray. As far as trim level goes... errrrrrrrrrr. huh? It' a 95 supercharged SSEI (i updated signature to reflect that). As for Oil level and cleanliness, I'm all good there. (changed yesterday)
...Oh yeah, and the car is Green...-Just like me -----oh yeah...90K miles on rebuilt engine.
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Old 07-06-2005, 10:24 AM   #5
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Sounds good...no problem on being new...we all are at some point.

Trim level is the SSEi

Congrats..I have one of those as well. Great year for a lot of stuff. Pain for other stuff...

My 95 SSEi (yup green) runs around 45-55 w/2krpm down the highway, about 20 at idle say a stoplight. Both these readings are after it'* warmed up.

What oil did you put in? 5W-30W would be thinner than 10W-30W. Might give you a little. But..I should add, you are running within spec and should be fine.
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Old 07-06-2005, 10:38 AM   #6
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Cool. Thanks fro the info. I don't see how I could be within normal range when the stupid warning bell (ding-ding-ding-ding) keeps sounding when I dip below 10. I also don't care for the digital indicator that makes it look as if your engine is gonna go boom when this occurs. What now?
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Old 07-06-2005, 10:41 AM   #7
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Sorry my bad...I thought you had said down to 10. I reread and see below 10.

Has it done this since you've owned it?...I'm assuming yes because you just got it. First thing you could try is to add a bottle of STP oil treatment. It'* super thick stuff and should bring the pressure up at least a little.
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Old 07-06-2005, 11:19 AM   #8
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yeah...It'* new to me. I will try the STP thing, but I'd relly like to find a soluiton to the problem. If you have any further thoughts on this let me know. I really appreciate the help. I want my bonnie to be HOT.
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Old 07-06-2005, 11:21 AM   #9
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Get the car to a mechanic and have a mechanical oil pressure gauge hooked up to verify what the pressure REALLY is. If there'* a noticable difference, change your oil pressure sensor.

Change your oil and filter, too.
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Old 07-06-2005, 11:30 AM   #10
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k- guess ill do that...I always change filter with oil
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