How you justify Tyre EXPIRE DATE, when u only have manufacturing date, but u never see any expiry date, or use period ?
Warranty period for Toyo & Michelin = 6 years
Bridgestone, Good Year, Continental, Silverstone, Dunlop = 5 years
So is that mean Toyo or Michelin use different rubber to have longer expire date ?
The tyre still can be use after 5-6 year from manufacturing date, but depend on tyre condition(explore to heat, radiation, ozone, rain .... etc).
Believe me, u still can find some car using year 2008 tyre running on the road, but not those classical car for sure. It the matter on how you take car your tyre.
But for sure, I suggest to change after 5 years use, but please do not influence by EXPIRE DATE, because it was not true.