After a long absence from an Audi, Im back. Picked up a A4 and am glad to be back. I few questions though. Rims suffer from curb rash and my friend has a set of 18's from an A5. Would they fit my A4, without too much of ride sacrifice, speedo being off, etc? Also, there is condensation inside the headlight lense, big issue or easy repair?

Not sure what specific sub model it is, how would I determine that? It has 120K miles from original owner and has always had service.

Thanks.