Hi,i have 22 plate 2litre tdi a3 and I'm going to service myself as audi want an astonishing £370 to change oil...what type of oil do I use and can I use adblue from aldis ?

Hello David,

Welcome and thanks for joining.

You are in grave danger of kissing goodby to your Audi’s warranty on your one year old car, by attempting to service the  car yourself. 

  I’m not sure if you own the car outright, or have it on something like a PCP, but whatever, the car will be deemed to have incomplete service history, and will be devalued accordingly. 
Sorry to point out that if you don’t know what oil to use, then you are not in a good place to start anyway. 
Adblue from Aldi’s? Same principle applies if you have to argue any warranty. 
Kind regards,

Gareth.