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My first winter w/ 75w140 in the diffs

Discussion in 'Towing' started by Sold My Subaru, Jan 18, 2019.

  1. Jan 18, 2019 at 9:41 PM
    #1
    Sold My Subaru

    Sold My Subaru [OP] 6MT AC TRD OR 1GR-FE FTMFW

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    I’ve spent this last fall & winter in the mountains of ID and have seen low temps well below 0 for about a week or so in length. Currently we’re having a heat wave with temps dipping into the 20’s at night.

    I switched to a heavier weight gear oil due to running the truck right at GVWR and sometimes a bit beyond that when hauling my slide in camper as payload.

    Last trip I scaled at 6k *gasp*

    I haven’t had any issues thus far running the heavier stuff and I don’t lose sleep at night as to whether or not it’s going to do any damage at these low temps.

    What have been your experiences with heavier gear oils at cold temps?
     
    Last edited: Jan 19, 2019
    monkeyface likes this.
  2. Jan 18, 2019 at 9:54 PM
    #2
    Catcrazed

    Catcrazed Love is Dogs and Toyotas

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    Central Oregon
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    91 Flatbed, 4.88's, ARBs, SAS, 3.4 Swap, 35s, M8000, lots lights, Aux tank, Protech
    Well the weight of all variable weight oils changes and is only a certain weight at a certain temp.
    So 75w90 and 75w140 are both 75 at whatever temp that oil was designed as.
    So on the 140 end it will only get to 140 weight if your diff reaches that temp.

    Hope that makes sence. Been doing alot of oil research lately.
     
  3. Jan 18, 2019 at 9:55 PM
    #3
    crazysccrmd

    crazysccrmd Well-Known Member

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    Sold My Subaru [OP] likes this.
  4. Jan 30, 2019 at 9:05 PM
    #4
    monkeyface

    monkeyface Douchebag, or just douche if we're friends

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    If you're happy shifting that 6 MT at -20 using 75W140 seems like you're good.
     
  5. Jan 30, 2019 at 9:19 PM
    #5
    Sold My Subaru

    Sold My Subaru [OP] 6MT AC TRD OR 1GR-FE FTMFW

    Joined:
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    Oregone
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    '13 TRD Off-Road
  6. Jan 30, 2019 at 9:47 PM
    #6
    Sharpish

    Sharpish Well-Known Member

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    I was running 75-140 all summer, pulling my travel trailer. Aside from the fluid friction effect (noticeably less power) it was fine.

    My rear diff was hot enough that it was ticking and pinging after 4-5 hours of straight towing, I'm glad I had the thicker stuff. It was probably water thin at those temps.
     

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