13 Dec 08 Is it okay to only replace two snow tires at a time?

Chris T asked:


Two of the snow tires on my G-35 still have tread and two need immediate replacement. I think I can probably get another season out of the two good tires. The tire manufacturers recommend that winter tires only be installed in sets of four. Is this a marketing tactic or is there a valid reason to repalce all 4 at once?

arnulfo