I just bought a new set of Goodyear Eagle slicks a while ago and now I am having 60' issues at the track as well as huge traction issues on the street (which I never had). I was looking at the slicks and they look alittle weather checked on the side. The tires say "D2793" on the side. Does anyone know how how to decipher that date code because I think I just bought a new pair of really old slicks???