I’m currently on my second set of Michelin’s (tad over 4 years old) and they are covered with side-wall cracks..... Tons of tread left but cracks that I can stick a fingernail into!!!!
I have always kept them covered when parked for any length of time and have never used any “products” on them.....
My first set had the exact same issue at about the same time period....
Now call me crazy but when I’m paying close to $550+ per tire, I expect them to last longer than 4 yrs....
(Note: I checked the manufacture date on them when I got them and they were new tires....)
I too had them on my cars and was always pleased with the results - but on my coach it’s a totally different story.... but
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