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High Oil Pressure??!!

clutch

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clutch Enthusiast

clutch

Posted
Posted

Hi Everyone,

 

I love my first truck, just purchased - a 2000 Silverado 5.3 with 18K miles.  Maybe this is normal, but when first started, my oil pressure gauge reads about 60 psi.  Under initial acceleration, it hits 70 psi!!!  It does decrease as the engine warms up, but seems too high for too long to me.  It never goes below 40 psi.  I'm worried about blowing a gasket, or worse.  Any ideas?  Could I have an obstruction or is this normal for this type/year engine?  I live in northern VA (moderate temps and driving loads) and use the appropriate oil weight as called for in the manual.  Thanks in advance for any info or advice you have.  

 

Great Forum!  I'm sure more questions will follow as I explore my vehicle......  

 

Clutch

CapnDean Enthusiast

CapnDean

Posted
Posted

Hmmm.....High Oil Pressure:

 

I wouldn't get tooo scared about it just yet...  But think about the possible causes of high oil pressure.

 

I don't know that super-thin oil would read any higher in pressure than would 5W-30.  In fact, I can't really see what could cause it to be sooooo high other than a defective sending unit or simply an inaccuarate dash gauge.

 

I guess that my only real fear in this case would be that with a reading so high, that in reality you could lose oil pressure almost all together...and still show a falsely high reading.  Suppose you ordinarily see 70 PSI, then suppose you lose 5 qts of oil through a leaky filter. [Okay so I am stretchin it]

 

You are too deaf to hear the knocking sound.  You look at the gauge and see 20 PSI and think "Gee...oil pressure's a little low, but 20 PSI is okay"  BANG.

 

I would change the oil myself this one time.  Making sure that I put on the right filter, right amount of oil etc..Quikie lubes are famous for screwing that up... Then see if you note any changes.  Still reading high?  Change the sending unit, Still reading high?  Get a 3/8 pipe threaded TEE and add a manual oil pressure gauge ($10 at a parts store) and see if it agrees with your dash gauge.  If it disagrees by a large amount...you'll know the gig.  If not?

 

Post on this board again for better help than you will find at a dealer!  Some of the techno types here are smarter than lil Jimmy Neutron!

 

CapnDean

MarkD Senior Enthusiast

MarkD

Posted
Posted

First off, I have an '02 running Mobil 1 5w30 and run a constant 60 psi oil pressure.

 

A 2000 w/ 18k miles should still be under warranty.

 

I would change the oil myself.  Use 6 qts. and an AC filter.

 

If it is still 70, I would ask the service writer at your dealer.

 

I would consider taking it in and getting the problem documented.

 

He can connect an Ohm-meter to the sending unit and check it out (the acceptable range is in the service/helms manual).

 

I wouldn't do too much troubleshooting on a warantee covered item.  If they say it is not a problem, get them to put it in writing (work order will have complaint and recommended solution).  If for any reason this does not satisfy you, poll the members for the acceptable range and test it yourself.

asepgrad98 Senior Enthusiast

asepgrad98

Posted
Posted
my 02 5.3L starts out at 60 and goes down to 40psi when hot. My 00 S-10 did the same. I wouldnt worry about it. But if you paranoid hook up an external gauge and test it.  :thumb:
Guest

Guest

Posted
Posted
To me, 70 doesnt really sound too high... As a matter of fact I wouldnt worry about it.. Even in my 75 Trans-Am, with an all original 400 I was hitting up to 80 under full gas... The only time to really worry about your oil pressure, (especially in a new vehicle) Is if it ever drops below 40 or so... Just my $.02... Ive never really watched exactly how high my oil pressure in my 4.8 goes... but for some reason 70 sticks out in my mind... :thumb:
Redapple Enthusiast

Redapple

Posted
Posted

My 2000 idles at about 45lbs. when warm. Under frewway driving at 70/75 does around 60lbs. Never had a problem. Don't worry, you are O.K.

 

 

BIll

Shaners Senior Enthusiast

Shaners

Posted
Posted
I'll see 65-70 psi in my 6.0L after the truck has been sitting all night and I'm cuffing on it a little (3K-3.5K RPM) because I'm just a tadd late for work!!!   LOL
SilveradoWV Senior Enthusiast

SilveradoWV

Posted
Posted
I have never really noticed on my 4.8 at take off, I usually run about 50-60 normal driving! Will try to remember to look at mine in the morning! I wouldnt get too worried at 70 though!
clutch Enthusiast

clutch

Posted
  • Author
Posted
Thanks to all for the great advice!  I really appreciate the feedback.  I won't worry as much, but I will go through the oil change and diagnostic steps as suggested by CapnDean and others just in case.    Cheers - Clutch
CapnDean Enthusiast

CapnDean

Posted
Posted

Hey Clutch....

 

You made me look at mine.  My 4.8 starts out at around 60 PSI and runs up in the 70's on the Hwy too.

 

I'd say that it's normal for this vehicle...Thanks for making me look at my gauges!

 

I do think that 70 PSI is a bunch when you consider the history of the internal combustion engine.  I always felt that 30 PSI was pretty much a benchmark.

 

But then I also grew up in an era where 180 was optimum operating temp.

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