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RS6 C8 2021 Gearbox oil change and sport dyff
Posted: Fri Mar 15, 2024 3:45 am
by Adi
Hi
I want change oil in whole drive system on my RS6 C8. What oil where to use ? Someone can help ?
Regarding to gearbox I need attached pic
mark 1 oil for front differential ?
mark 2 and mark 3 is it separate chamber?
mark 4 what kind oil I need to use ?
Thank you
Re: RS6 C8 2021 Gearbox oil change and sport dyff
Posted: Mon Mar 25, 2024 3:21 pm
by IanH755
On previous ZF gearboxes the two diffs (1 and 4 in your image) use a single diff oil reservoir whilst the gearbox core (items 2 & 3) again uses its own centre reservoir.
As to the fluids themselves I've not seen a ZF 8HP gearbox myself so I can only go off what the general internet has said so take that into account -
Gearbox - ZF LifeGuard 8
Diff - 75W-90 but so many different types that picking one is almost impossible (with/without additives etc).
Re: RS6 C8 2021 Gearbox oil change and sport dyff
Posted: Mon Mar 10, 2025 8:33 pm
by pvrs6
Did you found a service center in Europe to do it?
Re: RS6 C8 2021 Gearbox oil change and sport dyff
Posted: Wed Mar 26, 2025 6:44 pm
by JamesLawrance
Hey Adi,
Please see the attached with the part numbers for various oils for the 8HP.
#2 in your picture is Lifeguard 8
#4 is viscous coupling. Very expensive oil ~£130+VAT per litre.
ETKA lists that the front diff on the gearbox is the same oil as the viscous coupling. But I'm certain it's a good quality 75w90 GL5 oil in the front diff. But make sure you use the proper oil in the rear viscous coupling! Takes about 1 litre