My P85D came from factory with ContiSportContact 5's - 21" Wheels and non-staggered set up. At 5K miles I had to replace rear tires and replaced them with the OEM ContiSportContact 5's. Currently at 8K miles and now time to look at replacing other two tires. Looking at making a change to something with a longer wear rating like the Conti DW. I have never mismatched tires before as: 1. It would bother me to have different tires on the car 2. In my other AWD cars I was always under the impression that mismatching is bad for the differential. I am considering just ordering two Conti DW's and putting them up front and leaving the recently replaced ContiSportContract 5's on the rear as they are only 7/32 worn. Thoughts? Feedback? Thanks In Advance!