[s-cars] Tranny Oil: Audi G50 vs RL vs Amsoil vs Mobil 1

[Christopher Gharibo]

I'll be changing the tranny fluid in my 95.5 S6 soon and I am basically
interested in smoother shifts. To accomplish this...

Should I stick with the factory fill G50 or do one of the above brands offers
smoother performance?

Also Bentley specifies 90 weight oil for the rear axle on the S6. Would 75W90
be OK? Which rear gear oil is most recommended?


Thanks,
Chris


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