Volvo RWD 140-160 Forum

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Rear differential fluid 140-160

posted by  cef2lion on  Tue Aug 4 07:35 CST 2009
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last visit: Wed Jul 9 05:17 CST 2014
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Changing the rear differential fluid in my 68 144. What weight/spec oil is recommended? Scanned owners and Haynes manual and 90 weight was listed. Any reason to go synthetic?

Craig








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    Rear differential fluid 140-160

    uid 37336's pic
    posted by  B20Paul. on  Wed Aug 5 12:36 CST 2009
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    last visit: Mon Oct 20 10:54 CST 2014
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    If the diff is good - Straight 90, If it's noisy - 85W140

    Synthetic might save fuel, but I wouldn't risk putting it in a 30+ year old diff because it's sure to find leaks for you.







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      Synthetic oil will cause leaks - long-lasting urban legend? 140-160

      posted by  V7driver on  Wed Aug 5 16:31 CST 2009
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      last visit: Fri Aug 10 20:01 CST 2012
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        Synthetic oil will cause leaks - long-lasting urban legend? 140-160

        posted by  Charlie142 on  Mon Aug 10 05:29 CST 2009
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        last visit: Sat Jul 23 15:38 CST 2011
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        Yes switching to synthetic oil on a car with old marginal hard seals can increase leakage. Based on experience.








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        Synthetic DIFF oil - it's thinner. 140-160

        uid 37336's pic
        posted by  B20Paul. on  Wed Aug 5 17:42 CST 2009
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        How many 35 year old diffs have you switched to synthetic?

        There's not a big advantage in using synthetic oil in old diffs especially since a straight 90 oil lasts indefinitely.







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          Synthetic DIFF oil - it's thinner. 140-160

          uid 25346's pic
          posted by  GT144 on  Mon Aug 10 03:36 CST 2009
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          last visit: Fri Oct 24 04:32 CST 2014
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          I did...on my74 144..the rear axle is moist but it sure got rid of the humming.
          --
          ...and the bricks keep on rolling








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            Synthetic DIFF oil - it's thinner. 140-160

            uid 37336's pic
            posted by  B20Paul. on  Mon Aug 10 07:13 CST 2009
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            last visit: Mon Oct 20 10:54 CST 2014
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            What oil did you use? Is it leaking out of the axles or the pinion? Pinion leak usually means that the pinion bearings have lost their preload. Rarely does the pinion seal fail for no reason.

            --
            "Rupert Murdoch has done a fine job of recruiting an unpaid dolt army on behalf of corporate dominance concentrated wealth. " - Snootfull








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              Synthetic DIFF oil - it's thinner. 140-160

              uid 25346's pic
              posted by  GT144 on  Tue Aug 11 02:10 CST 2009
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              last visit: Fri Oct 24 04:32 CST 2014
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              I use Mobil 1. Its moist around the pinion housing. No dripping onto the floor, so I decided to live with it.
              --
              ...and the bricks keep on rolling








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    Rear differential fluid 140-160

    uid 779's pic
    posted by  matt b on  Tue Aug 4 12:18 CST 2009
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    last visit: Tue Oct 14 16:33 CST 2014
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    a '68 144 is good for about 300k miles if really well maintained....

    The Dana 30 rear is good for about 500k miles if poorly maintained behind a low power B18 or B20...

    Go with whatever.. it's the least of your concerns...

    --
    -Matt I ♥ my ♂







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