Love hate relationship with my Mack.

Discussion in 'Mack Forum' started by ChicagoJohn, Aug 10, 2016.

  1. Sharky88

    Sharky88 Heavy Load Member

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    Told ya lol. Good luck on the truck
     
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  3. ChicagoJohn

    ChicagoJohn Road Train Member

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    Thanks. I might actually like this truck again. Now if I can only figure out why the oil temp is running hotter then normal. This had been going on since about April/may.
     
  4. Sharky88

    Sharky88 Heavy Load Member

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    What's the temp and how often do you change the oil? How many miles / hours on the motor. Ever do rod and main bearings?
     
  5. ChicagoJohn

    ChicagoJohn Road Train Member

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    Over 70 mph, oil running about 235-240. I change oil every 20,000. Has 820,000 with 27,150 hours. (It's been a tanker truck almost all it's life). Couldn't answer the rod & bearings, only had it a year, but not since I've owned it.

    The obvious answer is to slow down to under 70, but that's no fun. :D
     
  6. Sharky88

    Sharky88 Heavy Load Member

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    At that mileage I doubt if any one did the bearings the oil is a little warm. Do you idle a lot? It could be the oil cooler is going bad. Any oil in coolant or reversed? Also in all my trucks from new I change oil every 12-15 k miles oil is cheap compared to a motor especially one with a lot of miles
     
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  7. ChicagoJohn

    ChicagoJohn Road Train Member

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    I thought it might be the oil cooler, but I no oil in the coolant or vis versa. I do idle a lot for unloading and sleeping at night. I think I'll lower the oil changes to 15,000 and see if that helps.
    Since in running across IN right now, I slowed down and oil is at 215-220°.
     
  8. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    20,000 is too long of an interval with all of the idling that you do. Go 12,000 and you will be good.
     
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  9. striker

    striker Road Train Member

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    My company is all Mack, our '07 and '08 had this issue, since you've only had the truck a year, I'll almost bet that this repair was done once previous to you buying the truck, my '07 had it done twice, before they replaced the coppers with stainless, and that was in less than 570K.
     
  10. ChicagoJohn

    ChicagoJohn Road Train Member

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    I can't get over how much better this truck runs. The low end torque makes a huge difference. I had a chance to pull a load Friday that had me at 79,780#. It's still not a C15, but I'm happy and don't have to constantly downshift to get it going.
     
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  11. Mack427

    Mack427 Medium Load Member

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    how is your water temp running ever blow out the radiator? the cooler the water the cooler the oil
     
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