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Audi S3 service intervals - El Hacko Jr
Can anyone advise me on my S3 service intervals? I don't really feel comfortable with Audi's 12-15000 intervals.
Audi S3 service intervals - Cupramax
If your car is on Audi variable service the dealer will use different oil to what they would if you are on set intervals. There should be no problem running and S3 for 15k between services.

More important on a turbo car is ensuring you allow it to warm up properly before giving it any welly and letting it cool down before switching off if you've been driving it hard. This will increase the life of the turbo.
Audi S3 service intervals - DL
6000 mile oil changes!
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Audi S3 service intervals - Ian D
If you can do oil chages yourself do an extra oil and filter change between services (6 - 7500 miles) using an Audi filter and sump plug washer and the same oil that is used by your dealer, that way your engine will last and your warranty won't be affected as they know no better.