Hi guys and thank you for your contribution and time!

I am going to start doing a 100 mile commute to work each day and want to make sure my 2011 2.0L TDI 170 BHP C6 A6 Avant Le Mans is ready for it and set up properly.

Amongst other things I saw a K&N replacement air filter and wondered what peoples opinion of them are, worth it or better to keep to the original?

Also what else should / could I look into doing? I only use Shell / BP diesel, are diesel engine cleaners worth their value or are they a waste of time with the Audi 2.0L 170 diesel engine.

The car was serviced 1000 miles ago and the oil and the fluids were all changed.

Thank you in advance for your help and advice!