The 2008 E63 wagon calls for the 245/40R18 tire size. As I just bought it, I am considering changing out the 3 year old Yokohama tires it came with. I am a fan of Michelin tires, but I'm not married to them and would welcome suggestions. One thing, can I go one side wider and is it of any benefit? I have no tire issues currently, the Yokohama's handle just fine with no vibration or obvious wear, just considering improvements. Thoughts?