I just went thru this with my SPF, found all my tires were 8 or 9 years old. Tried to order tires from a number of sites including TireRack but none would confirm date codes on tires being bought. Finally found a Tires Plus that agreed to order in the tires I wanted and allow me to confirm date codes before paid for - they had called the source and apparently somebody agreed to actually go look at the tires before they were shipped. Anyway got 4 new tires all dated the 20th week of 2008
