Had the oil changed on my S5 sports diff today even though my indy said the diff is sealed for life. The RS5 sports diff needs an oil change at 58k miles so I see no reason why the S5 shouldn't be the same.
Your existing tyres are the wrong width, you should have 255/30R20. If you want a thicker sidewall you will need a smaller wheel in order to keep the tyre circumference correct.
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