My car came fitted with Michelin 185/55 R15 82H XH1 tyres. My dads car has now arrived, and is fitted with Contis of the same size. Hes not very fond of Contis, and want us to swop wheels. Ive already done about 6000 miles in my car, but the tyres still look great. Would it be wise of me to swop them for brand new Contis?