I was told by my shop that I should look into getting new tires because it's showing cracks. The cracks are in the tread and between the tread but not the sidewall. I attached a pic below. Tires were put on in '09 (4 years ago), manufacture date says 35th week of 2008 and it's driven 3-5 days a week, so doesn't sit for long periods of time unused. They are ltx a/t 2 michelin tires. Any opinions about how much of an emergency this is? On the pic you can see the wear bar just left of top center and there's plenty left.
Thanks in advance!