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Oil Temp

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by Un4seen4, Dec 8, 2010.

  1. Un4seen4

    Un4seen4 New Member

    I have a 97 with the 454 in it, no matter what time of the year the oil temp on the thing never reaches its mean temp. I put standard 5W30 GTX in the thing. i have also noticed that once its been driven and warmed up the oil pressure will swing wildly when idling vs accelerating.

    any thoughts?
  2. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Well depending on the swing wildly, its normal for the older motors to go from 15-20psi at idle (sometimes lower) up to 40-60PSI with throttle input.
    As to the oil temp? you have an after market guage? and is it electric or mechanical?
  3. stephan

    stephan Rockstar 3 Years 5000 Posts

    Hey UN4, welcome to the GM truck club. What IS your oil temp reading?
  4. Un4seen4

    Un4seen4 New Member

    its just the standard stock gauge cluster on the dash and as for the temp it runs at, i tried to calculate it but the gauge has the oddest distribution of set marks i had to check it a few time just to make sure i wasn't crazy


    100 | | | I | | | 210 | | | I | | | 260



    this is the best i could do with text, the first bold tick between 100 and 210 is where is sits
    Last edited: Dec 8, 2010
  5. stephan

    stephan Rockstar 3 Years 5000 Posts

    OK, that looks like about 155 F. I would guess that the sender or the guage is bad because if your engine is running 195 200F the oil temp should be at least as high and possibly as much as 20-30 degrees hotter. I would check the sender first as it is the cheapest & easiest to replace.

    ** Do you have extra oil coolers, auxilliary oil filters, or an aluminum deep sump oil pan on this engine?
    Last edited: Dec 8, 2010
  6. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    The guage you have posted up is the Coolant temp guage... there is no Oil temp guage in those trucks... and its looking like its time for a new T-stat since the coolant isnt getting as hot as it should. you should be right up near the 210 mark.
  7. Un4seen4

    Un4seen4 New Member

    forgive my ignorance but T-stat ?
  8. stephan

    stephan Rockstar 3 Years 5000 Posts

    UN4, He's talking about your thermostat. It is what controlls your engines minimum temp. If Murdog is correct & that is the temp guage that you're looking at, then it is running too cold & the thermostat is stuck open & causing the coolant to run too fast & not allowing the engine to warm up. Is that in fact the engine temperature guage that you are seeing, or is it an oil temp guage?
  9. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    X2 on thermostat, i usually type it out since most peoples slang for parts doesnt always translate to other mechanics so really it wasnt ignorance just me being lasy with typing.....
  10. Un4seen4

    Un4seen4 New Member

    managed to replace the new one with little trouble, come up to a higher temp now but cools down quick, better than no heat at all i guess

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