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95 5.7 oil pressure low

95z71performer

By 95z71performer
in Ask A GM Technician

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95z71performer Enthusiast

95z71performer

Posted
Posted

I recently bought a 1995 silverado with a 5.7 and the oil pressure is low...and I need an o2 sensor for the headers :flag:

 

any suggestions as to what could be the oil problem I believe it's the oil pan gasket because the oil pan is wet

 

not a bad truck for $2500

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Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

A leaky pan .. or any other gasket won't cause low oil pressure. Bad bearings will .... but before you condemn the lower end, put a GOOD gauge directly in an oil port - don't rely on the dash gauge. They're notoriously inaccurate.

 

I'd only replace an o2 sensor on a '95 if it was getting less than 15 mpg - just fyi & my .02 ...

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

When trying to locate an oil leak, remember, oil leaks down. Find and correct the highest leak you can find first.

 

If you are seeing low oil pressure due to low oil level, damage is done. If the oil level is low enough to allow air to be drawn into the oil pump that will cause aeration and foam in the oil passages. Normally you cannot compress a liquid(it will compress slightly, but not noticeably), but, put some air into it and it can now be compressed. The pump will not move the oil if it can compress it.

 

As said above, make sure oil level is full, then put a mechanical oil pressure gauge on it to test oil pressure. Acceptable oil pressure has always been expressed as 10psi per 1000 rpm. Last time I checked for a spec on a sender for oil pressure light, it was built to turn oil pressure light on at 7psi.

95z71performer Enthusiast

95z71performer

Posted
  • Author
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I might not get o2 sensors but I will get something to plug the hole in the headers and the exhaust system I'm planning on trying to do is side pipe in front of the rear tire to save some on exhaust pipe will that help anything in terms of back pressure

efritz Enthusiast

efritz

Posted
Posted

What we do at work when those old 350s start losing pressure is put Rotella 15-40 in them and go another 100k lol. I wouldn't worry too much, they just keep on going.

95z71performer Enthusiast

95z71performer

Posted
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That they do but I've found out through driving my uncles truck last night that it's normal he has the exact same thing (and only 100 miles separate our odometers) except his is a stepside

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

What we do at work when those old 350s start losing pressure is put Rotella 15-40 in them and go another 100k lol. I wouldn't worry too much, they just keep on going.

And when that stops working, you go to 20w-50. :smoker::thumbs:

95z71performer Enthusiast

95z71performer

Posted
  • Author
Posted

Oil leaking now from a weird place...the place for the dipstick and I think it needs a gasket for the oil pan as well ever seen that happen like this?

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