I have had to fill one of my tires twice this week, so i stopped by Les Schwab to see if i had a nail or something and they told me that the wheel was corroded which was causing the air leak, and low tire pressure was starting to wear the tire down on the outside. He then said i should buy all new wheels and tires, when i asked if i could just purchase one wheel and be okay, he said better to buy all four. i didnt have him check to see if the other wheels were corroded or not, cause i didnt have time. he put some kind of sealant on the corrosion to help stop the air from leaking. my question is why wouldnt i be able to just purchase one new wheel? other than the fact that he wanted me to buy Les Schwab wheels instead of a cadillac wheel, it seems okay to just replace the one, although the dealership wants six hundred for it. i feel like les schwab's was just trying to make a quick sale on new tires and wheels, to a girl who doesnt know better... can anyone recommend an online source for wheels? Will this sealant fix work, for how long? i saw the corrosion, didnt seem major to me...i am just not in the mood to spend a couple thousand dollars on tires and wheels at the moment, and the wheels they showed me at les schwab were pretty cheesy unless i was willing to pay a ton...also, why would such a nice expensive wheel get corrosion? if i do end up paying a ton, how can i prevent it from happening to the new wheels?