The maintenance interval may vary depending on the year of your 3.0t engine. The spark plugs are recommended every 45-55k depending on your Audi model. Consult your Audi owners manual if you are looking for the specifics on your vehicle. Regardsless of the interval keeping fresh spark plugs in your 3.0t engine will ensure you are getting the power, performance and fuel economy you should.
To be used for OEM# 101905631G, 101-905-631-G, 101-905-611G, 101-905-611-G
Here is a great DIY on how to change the Spark Plugs on a 3.0t Audi