I would first check the fab key battery as the immobiliser may not be reading the key. Next run fault codes and look for crank/cam position sensor fault. as they all cancel out the spark to prevent ignition.
SOURCE: Oil for 2007 AUDI A4 2.0t Quatro
The best balance of price, quality, availability that I have found is Mobil1 synthetic - it's on Audi's approved oils list. With the 2.0T engine, you absolutely want to use synthetic (the Audi turbo fours are known for oil sludge issues), and you want to do a SeaFoam treatment every 15k miles or so - that combination will keep your engine in great running shape.
SOURCE: Core Support and Radiator Replacement , Audi A4 Quatro 1.8
Very easy - the car is designed to have these parts as being removable for the timing belt service. Opening the car is called the "service position" and involves taking these parts nearly off the car. Use the link below (it's a link to a DIY procedure for doing the timing belt on the car) - it'll show you what to do in order to remove the front clip of the car and remove the core support and radiator.
http://www.audiworld.com/tech/eng35.shtml
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