You know, I have the same problem with new tires... I believe that it's the release compound... It sure does take a lot of miles to get it off, though!!
On a slightly separate note... I am having the same kind of symptoms from my new snow tires, but a bit more severe -- the car seems to be tracking irregularly and unpredictably in sweeping bends. I used to have Dunlop M3 Sport Winter tires all around, but then got a rear flat and had to replace the rears with Bridgestone Blizzaks (they don't make M3 Sports anymore)... could the difference in the treads really make THAT much difference? I do have the same brand tires on the front axle and the both blizzaks on the rear axle... I was just hoping that I didn't have to change all 4 tires just because of one flat tire... could there be any other reason for the unsteadiness of my car, especially at higher speeds? Or is it time to buy 2 more blizzaks for the front wheels?
'07 Space Gray 335i coupe - R.I.P.
COBB ProTuned | AMS | CP-e | BMS | Quaife