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

Discussion in 'A3/S3 Forum (8L Chassis)' started by Ashley g, Nov 6, 2011.

  1. Ashley g
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    Ashley g Member

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    [Nov 6, 2011]
    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
    #1
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  3. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Nov 6, 2011]
    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
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  4. Ashley g
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    Ashley g Member

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    [Nov 7, 2011]
    So semi synthetic will be ok? Can anyone confirm this? Ta
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  5. beanoir
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    beanoir Sharpest Tongue in the West

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    [Nov 7, 2011]
    yep, semi synth is fine.
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  6. SiGainey
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    SiGainey Member

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    [Nov 7, 2011]
    seconded. Syntrax in mine with no issues
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