I know all about that Teflon coating and it is 100% crap. All though I dont want to get into all of the details, just know one thing, it is a complete rip off and does next to nothing. Use a good wax, the teflon acts like a wax only 300 times the price. The years they quote about never having to wax is also bogus. It must have been the nissan dealar trying to sell it because I have never heard of a BMW dealar trying to sell it.