Ive been running 5w40 or 10w40 syntheticin my car and its about time for another oil change. its pretty cold here in chicago so Im wondering if i should use another oil that will flow better in the cold. I did some searching but I couldnt find anything solid.

 

I suspect you won't find anything really solid, either. There are as many professional opinions on oil as there are brands of oil.
I can't comment directly on your Audi, but.......

5w-40 in the winter is great for the winter unless you live somewhere where the temperatures get into the negative 10's or 20's, where 0w-30 or 40 would be better. 5w is pretty lightweight oil if you've ever played with straight 5W;the stuff flows pretty well when even when it's nasty cold out. I have no scientific basis for this opinion either, but in both of my old cars ('95 and '96 Volvo 850) I've done 5w-40 in the winter and 10w-50in the summer. I live in New Jersey. The '95 has 265k miles on it's mill at this point, so it works at least a little bit!

-Red

 

If you can find it, 0-40 would be great. Tough to find though.