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oil consumption 900

posted by  wannagtd on  Mon Feb 28 13:39 CST 2005
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Hello to all. A question about oil consumption. My 940 turbo currently has 15w40 dino oil. I was recently at a volvo dealership I happened to ask the service guy what grade oil I should be using in my car. He said 10w30. I guess my question is if I were to switch 10w30 would I be causing problems for myself, like unusual oil consumption or leaks doe to the thinner oil. Thankyou in advance.








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    Viscosity Change 900

    posted by  Dick in Falls Church on  Mon Feb 28 13:57 CST 2005
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    last visit: Fri Aug 1 10:33 CST 2014
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    As long as the engine isn't using or loosing oil now, you shouldn't have any problem going to a bit lighter viscosity. You might pick up a bit of fuel economy or pep, since the lighter oil will have just a bit less internal drag.

    Same goes for a change to synthetic, if not using it now. If you have reasonably high mileage, you should probably use a good engine flush before switching to synthetic. I recommend the flush made by AMSOIL or BG. If you are willing to take longer to flush, you might want to try Auto-Rx.








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      Viscosity Change 900

      posted by  c1800 on  Tue Aug 13 19:23 CST 2019
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      last visit: Sun Oct 5 19:37 CST 2014
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      Some say not to flush, may dislodge larger chunks and block some passageways. Synthetic will, over time, clean up the sludge in the engine. May require a few earlier changes, as the oil will go black sooner. At least that’s my experience. YMMV.








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        Viscosity Change 900

        posted by  Blindboy on  Wed Aug 14 21:57 CST 2019
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        a really thorough mechanic told me to us a pnt of flush & drive for 30 mins at 30-45 mph &then drain in got way more crud out & no car runs much smoother







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    oil consumption 900

    posted by  Andrew in AL on  Mon Feb 28 13:49 CST 2005
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    last visit: Fri Oct 24 06:17 CST 2014
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    I can see no problems in switching to 10w30 - especially dino to dino. You might ...MIGHT, experience some problems with seals if you went to synthetic. I did it on a 91 940 w/170K and it developed some seal leakage. Then again, this was a sign that new seals were in order.
    --
    '89 764 (110K), '94 940T (180K) , '92 745T (totaled 2-10-05 RIP)







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