I have a 2017 s60i T5. The dealer said, they dont recommend rotating the tires. The front are worn down 3mm more than the rear. I talked to Costco and Discount tire,etc. Nobody will rotate them if i pay. Pep Boys said, they recommend the rear tires have more tread then the front. I dont get it. I have a front wheel drive car not rear wheel drive. If i hit a big puddle the front tires will hydroplane under these conditions. Does anyone have any thoughts about this. This seems weird to me.