My Honda Odyssey is on its original set of tires with a DOT date of 2313, it was one of the early 2014 production models. They are the Michelin Primacy MXV4 tires and have 40,000 miles on them and still have 7.5/32 of tread. I'm noticing that they don't seem to grip quite as good in the rain and we haven't had snow yet to see how they do again this year. Some places say to swap tires every 5 years but these just don't have any typical Michelin cracks or anything, they look and ride great still. Should I keep running them until 4-5/32?