Hig Oil Pressure - 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 07-13-2008, 12:41 PM   #1
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Default Hig Oil Pressure

Hey all -

Sometimes my oil presssure gauge reads one tick below max. Usually when I first start it. After 10-15 miles it drops to somewhere below 60 - 70, eventually going to 40 (which is about where I think it'* supposed to be). On the other hand, sometimes it makes no difference how long I drive it, it stays around 90 (Or, between the next to last gauge tick and the one before it).

The problem seems to be the worst after an oil change, which makes sense to me, as although I'm not a petroleum expert (except I do know it'* damn expensive), it seems to me the viscosity would be much higher than it would be after 3,000 miles.

I don't think it'* the sensor, it'* been replaced.

A bit more info: I need to change the oil pan out, as the one on it arrived slightly crushed from the salvage yard. Also the mechanic told me it didn't have the hole for the oil level sensor, so I want to replace it anyway - (if anyone has one they want to get rid of, please let me know). Could a damaged oil pan be a contributor? I don't think it'* so badly crushed that the oil is getting churned by the crank, but I could be wrong about that.

One other thing; since I fixed my courtesy lamp problem, the gauge seems to read lower more consistently (although it still reads high till a full warm up). Dunno if this is coincidence; it'* been a while since my last oil change - but I always see comments in the forums talking about how just about any electrical problem anywhere in the car will mess with the instrument panel.

Also, I couldn't find the thread, but I seem to recall there being some sort of oil pressure regulator, I think just behind the filter somewhere.

I'll be taking it up to get a mechanical reading, but assuming the electronic one is being honest, I just wanted to be knowledgeable about the regulator, assuming my memory is correct and one does exist.

After replacing the motor twice because of low oil pressure/bad bearings, I really, really, really, really (I could go on forever with that) don't want to blow an engine or seal due to high OP.

One final thought - is there any type of lubrication system "cleaner", and if so, does anyone recommend I use it?

One more final thought - if the OP is high, and I gun the motor to get the RPM'* up, the OP drops, but only for as long as I'm gunning it.

Maybe I'm just high, I dunno. I tend to worry too much. But spending last summer with no car at all will do that to ya.

Any comments much appreciated.

Thanks
Matt
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Old 07-13-2008, 01:24 PM   #2
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I was having a similar problem on my 99 bonne,you see whoever tried to change the oil before i had it striped out the drain plug so i had to replace my oil pan and when it was replaced they noticed the pick up tube was bent so they replaced it. After that my oil pressure stabilized at 40. If you say that your pan is bent then it might have damaged something within the pan such as the pick up tube or the pump itself.
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Old 07-13-2008, 06:02 PM   #3
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Cool - that never occured to me. Thx 99, I'll find a new pan and check it out.
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