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Does gearbox/transfer box and rear diff oil have to be fully stnthetic?

Ashley g Nov 6, 2011

  1. Ashley g

    Ashley g Member

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    As above really! I'm going to be changing the gearbox and transfer box oil on My 8L S3 tomorrow and was just wondering. I've got 25l of semi synthetic 75w 90 at work so would be handy if I could. Would this be OK for the rear diff too?
    Does it really have to be a fully synthetic oil?

    Many thanks, Ash
     
  2. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

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    It's supposed to be sealed for life, so any new oil will be better than the rubbish in it.

    I have deffo used semi in cars with no problems at all
     
  3. Ashley g

    Ashley g Member

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    So semi synthetic will be ok? Can anyone confirm this? Ta
     
  4. beanoir

    beanoir Large Member

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    yep, semi synth is fine.
     
  5. SiGainey

    SiGainey Member

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    seconded. Syntrax in mine with no issues
     

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