Thank you Skip! An excellant post!
My brother and I had heard about the nitrogen "theory" many many times in the past 30+ years. As it hasn't been around for a number of years we had actually thought it had finally died away. We were very doubtful that Costco actually found some new air for inflation. I was surprised that the "theory" was revived once again.
Costco is apparently using this as a sales gimmick no more no less. They get you in their shop for the $3 tire inflation and while in there they find a series of other problems with your vehicle.
Please consider the fact that if nitrogen was THE gas for inflating tires ALL of the BIG TIRE MANUFACTURERS, Goodyear, Bridgestone/Firestone, BFG, General, Uniroyal, Etc would ALL have their service centers using nitrogen. Once agian for a second opinion contact ANY REPUTABLE TIRE DEALER and apparently Costco is not one of them
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