'84 Audi 4000S Quattro gear oil

Hi all, just curious if someone that still has an owner's manual or a tech manual might know if there's any specific or special kind of gear oil I should use for the transmission and differential. Is regular 90
weight gear oil appropriate?
Thanks, Chris
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Chris, In the 5ktq, it's GL-4 in the transmission, and GL-5 in the rear diff - mixing up the two will damage the brass synchros in the transmission. Searching www.audifans.com comes up with: According to the Bentley, the 4kq transmission takes SAE 80W or 80W/90, GL4, and the rear diff takes SAE 90, GL5. HTH, Cheers! Steve Sears 1987 Audi 5kTQ 1980 Audi 5k 1962 and '64 Auto Union DKW Junior deLuxes (SPAM Blocker NOTE: Remove SHOES to reply)

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