Thanx Ldub & Rowhard for sharing this important info with the VX community. I knew about these tire codes, but they got lost somewhere within my brain cobwebs. Puzzling though; they mentioned six(6) years was the magic number for tire replacement, but they never specifically mentioned "why" in the video. My guess is dry-rot and/or UV damage. Speaking of "UV"; a great product with UV inhibitors that can be used on tires is SUN OF A GUN made by STP (very simular to Armor-All, but with UV additives).