I used to sell these tires at Sears and when I would call BFG and Goodyear about the tires cracking they would always explain to me that if the tires were treated with Armor All (AA) then the warranty was void.
Putting AA on your tires is like wearing baby oil in the desert...not good, the tires already draw a lot of heat from being black then adding Armor All is like putting a magnifying glass to them as much as you would think that it would moisturize them it doesn't. There are other brands that are safe to use to shine up with but just stay away from the ol' AA.

 

the same thing happend to my tires on my 04, ford replaced them for free.







edgess01
2004 blazin yellow supercab FX4

 

'cuz Lord knows, anyone who ever worked part time for $.45 over minimum wage five years ago is an expert on tires and chemical effects of tire shine products

 

I got a set of (4) of those tires at the house in the garage I can't seem to get rid of... they don't have any cracks on them.

I wouldn't worry about the cracks though.. Just surface cracks.