Audi S4
Hey just thought I'd respond. I have had a B7 A4 and currently have a B6 S4. I personally like my S4 better than my previous e46 M3. As far as maintenance goes the S4 and A4 were basic maintenance with an occasional sensor going out on the A4. The coilpacks were replaced under warranty through Audi. They require prem gas and synthetic oil; good luck with your purchase!
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