There could be a lot of things in your pocket. I am guessing you have a stick of gum in your pocket.
Dairy, Grain, etc. lol
for a3 1,8t 2007 ,08,.... you must use oil with SAE 5W-30.any oil with these characteristics will do.of course you can also buy Audi oils(not recommended-very expensive) or aral longlife III SAE 5W-30 whits is the exact same think!!!if you check the botom an Audi brand oil bottle you will find out the oil manufacture is ARAL !!!!SAVE YOUR CAR AND YOUR POKCET!!!!!!!!!!!!