Is it neccesary to use synthetic fluid in my rear diff and my trans/front diff? It was severely low when I got it and the synthetic stuff is so expensive. Its an old car, not a show car. What do you guys think?
80 quattro DIFF flud
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The rear diff is a hypoid-transmission. The hypoid-transmissions need ja special oil. It is a 75W90 GL5 (<- !!!). For the front transmission you need a 75W90 GL4+.
Don't use other oil, it could damage your transmissions. GL5 in the transmission could destroy the synchronizer rings and a GL4 oil in the diff could damage your diff-wheels. On ebay you can buy the castrol GL4+ and a GL5, maybe from LiquiMoly or castrol, too.
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75w-90 GL5 is about 10 bucks / Liter.
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