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Coolant/engine oil temp.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by seabring, Sep 19, 2012.

  1. Sep 19, 2012 #1
    seabring

    seabring Road Train Member

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    Apr 24, 2011
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    What is the relationship between the engine coolant and engine oil temps? I had one driver tell me if the oil temp gets hotter than the coolant temp it is a bad thing. Is this true? My oil temp was hotter than the coolant when I came over donner pass . The coolant temp dropped lower than the oil temp shortly after cresting the summit and going down . Then the oil came down to about ten degrees cooler than the coolant.Should the oil always be cooler than the coolant or what? What is normal temp differences between the two?
     
    seabring, Sep 19, 2012
    seabring, Sep 19, 2012
    #1
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  3. Sep 19, 2012 #2
    Driveone

    Driveone Light Load Member

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    Oct 26, 2011
    South Carolina
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    If your oil over heats could be anything lower and main rod bearings egr ....
     
    Driveone, Sep 19, 2012
    Driveone, Sep 19, 2012
    #2
    kw9's rock Thanks this.
  4. Sep 19, 2012 #3
    truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
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    What kinda engine as long as oil dosent go over 250 that's not good if your oil temp is hot but coolant normal then you have a problem in the oil system like oil thermastat bearing and such if cool temp is hot then oil will be hot.check your fan hub check to see if the rad is plugged that will do it quick I just fixed a pete 389 running hot on oil and cool pulled charge air cooler and the rad core was plugged solid cleaned it and went back to normal.
     
    truckmechanic, Sep 19, 2012
    truckmechanic, Sep 19, 2012
    #3
    Rounded_nut and seabring Thank this.
  5. Sep 20, 2012 #4
    Gear head

    Gear head Medium Load Member

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    Belair,md
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    oil temp will run about 20 to 25 degrees hotter than coolant on hard pulls nothing to worry about.
     
    Gear head, Sep 20, 2012
    Gear head, Sep 20, 2012
    #4
    Rounded_nut, Boardhauler and seabring Thank this.
  7. Sep 20, 2012 #5
    Heavyd

    Heavyd Road Train Member

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    Like Gear Head said, oil is normally hotter than coolant. 195 or so for coolant and 215 for oil, ballpark.
     
    Heavyd, Sep 20, 2012
    Heavyd, Sep 20, 2012
    #5
    kw9's rock Thanks this.
  8. Sep 21, 2012 #6
    seabring

    seabring Road Train Member

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    Thanks for the replies. Sounds like I am worried about nothing.
     
    seabring, Sep 21, 2012
    seabring, Sep 21, 2012
    #6
  9. Oct 1, 2018 #8
    sercanu76

    sercanu76 Bobtail Member

    1
    0
    Jul 13, 2012
    treviso / italy
    0
    Hello everyone, I have the same problem on my mx13, uphills the oil temp goes up 250, sometime 260 while the water stay around 200/210 always uphill.
    On plain, water is 180 oil 220 and I’m pretty sure was working different before the summer. I remember only about 10 to 20 degrees difference between water and oil.

    Already changed the sensor and thermostat
     
    Last edited: Oct 1, 2018
    sercanu76, Oct 1, 2018
    sercanu76, Oct 1, 2018
    #8
  10. Oct 1, 2018 #8
    spsauerland

    spsauerland Road Train Member

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    May 31, 2010
    West Harrison, In
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    Have you ever put stop leak in cooling system?
     
    spsauerland, Oct 1, 2018
    spsauerland, Oct 1, 2018
    #8
  11. Oct 1, 2018 #9
    thaistick

    thaistick Road Train Member

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    Dec 7, 2014
    OTR/Thailand
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    S60- coolant 183 oil 195
     
    thaistick, Oct 1, 2018
    thaistick, Oct 1, 2018
    #9
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