I was taking my Audi 4kq factory wheels/tires(they were not holding
air according to the PO) to a friend who does fancy wheels and tires
and he put a lot of work into them to get them to seal up again.   He
found almost 8 oz of water in one of the tires, likely from repeated
trips to a local "free" air pump at a convenience store or other
outfit.  He asid that many air compressors without adequate filtering
will shoot a very moist air into the tire and over time, you get
water in there that will freeze in the winter not to mention cause
strange balancing issues.  He also put nitrogen in the Audi tires to
cut down on expansion and contraction issues with regular air.  He
said it's hard to get 100% nitrogen in there, but 95% was possibble.

Any one have experience with this?  I owuld figure race car drivers
would benefit from this, but he showed mea dozen samples of water
collected from various tires he's broken down and to look at it would
make you puke!!

DM&FS