I have a 535d Touring fitted with Continental Sport Contact 3 245 45 R18 96Y SSR tyres. The tyres are coming up for replacement and I would like to fit Sport Contact 5 tyres as a replacement. The only tyres I can find in this size are 245 45 R18 100Y MOE SSR. These are Mercedes runflats that I understand have softer running characteristics and reduced deflated driving distance of 80km. Has anyone any experience of these tyres on their BMW.