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Question on oil pressure?

Discussion in 'The Lounge' started by MT ZION, Jan 7, 2002.

  1. MT ZION

    MT ZION Registered Member

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    Hello,

    I was wondering if anyone could help me out on this. My girlfriend has a new Chevy Truck. She just took it into the Chevy dealer for the first oil change, and I noticed an increase in the pressure gage. The pressure reads almost eighty at times, is this o.k or did they over fill it?

    thanks,

    John Nitowski
     
  2. muddin4fun

    muddin4fun 3/4 ton status

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    Check the oil level.

    That'll be five dolla <img src="http://coloradok5.com/forums/images/icons/smile.gif">

    It could be a bunch of things. You need to check the oil level though.
    -The oil could have been low when she took it there. Now it's full. It's not likely, but it's possible.
    -They might have put a different weight of oil in it.
    -When the pressure was at 80, was the truck warmed up or was the engine cold? Temp plays a big part.
    -They might have over filled it

    Check the oil level first though. Also, you might post this in the new truck forum. Either that or pm grim-reaper and ask him to move it.



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  3. MT ZION

    MT ZION Registered Member

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    Hello,

    That's what I planned to do next, If the oil is over filled how bad is this on the engine? Should I tell her to take it back in?
    Thank you for the information,

    John
     
  4. newyorkin

    newyorkin 1 ton status

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    I don't know how overfilling effects new engines, but in older ones, it isn't desirable. I read a lonnnnnnnng time ago when I was a Mopar man that overfilling the crankcase can actually cause slight resistance for the crankshaft (because it has to splash through the oil, but that'd have to be really overfilled). It can also airate the oil, which counters it's lubricating effects.

    I wouldn't be terribly concerned if it's reading 80 in lower temps, then reading lower when warmed up. My truck will actually push 80psi at idle when I first start it in real cold weather, then calm down to about 25-30 at idle. I'm still running my summer oil, though 10/40...



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  5. MudNurI

    MudNurI 1/2 ton status

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    New truck as in brand new or new as in like 91-92 new? our 99 did and our 01 runs at about 70-80 PSI- the '01 actually climbs a bit higher at times- our older trucks run 1/2 that- so guess it would depend on what you mean by NEW?

    Brandy

    LOVING the new Duramax!!!
     
  6. MT ZION

    MT ZION Registered Member

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    Her Truck is a 2001.

    Thanks,

    John
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I would check the oil level, and after that, not worry too much.

    I have never been one to trust an electric oil pressure gauge to be completely accurate anyway.

    On a mechanical gauge, I have 70 PSI of oil pressure at a very cold idle with 5W-30. If I rev it up, it'll go to about 75 and I guess the spring opens on the oil pump and it won't give me any more than that.

    I have 20-25 psi hot idle. This is pretty much typical.

    Your girlfriend's truck, if it has a gas engine, should take about 6 quarts of oil.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  8. Ddragggon

    Ddragggon 1/2 ton status

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    I can't help with the new truck bit, but the new engine thing I have experience with... my 77 C20 has a new 454 in it ( ok, so its a full year old now, but you know) it was a pleasant surprise the first time I started it, and watched the pressure gauge climb strait up past the 60 mark. even after it warms up, it still idles out at 50+ PSI ( using thin oil for Winter here too... Strait 30 HD... its AZ, and not cold ever :-P ) was this the first oil change on it? the oil that was used could have been a thinner oil for the break in period, to allow the rings to set, the cam to wear in, and whatnot, and now that its all done, they've put some better oil in it. hard to say tho.. I wouldn't worry about high pressure so much as low pressure...if the oil level is a little high, ( 1/4-1/2 inch over full) I wouldn't think it'd be too bad. much more then that, and you've got more quarts then you need in there, and should take it back to get some drained off.

    good luck with it,

    -Rich

    My truck isn't ugly, you have a skewed sense of beauty

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