The tires are Conti Extreme Contact DWS. My buddy owns a tire shop, and when I bought it I knew the tires were not all the same age so I took it in. They were all almost new with the exception of one, which I replaced. They conferred with the BMW dealership that the minuscule wear difference between the tires would not present an issue. But I guess that could be something to look into. I cannot say with 100% confidence there had been no patches. But the difference between the four tires is less than 1/32".
I'll take a look at that thread.
I finally took a few iPhone photos of the interior...
