With this horribly cold weather we've been experiencing, I also noticed that my MB-Tex has developed two hairline tears in the otherwise immaculate interior (driver's seat). I guess because the weather is so cold, I sat in the car and the covering tore. I want to do something before the tears become noticeable to the untrained eye. I keep the interior oiled all year, but I guess that only does so much good. As far as your leather, I would think the only fix is to have the seats recovered, although maybe someone has a better (and cheaper) fix.
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'79 6.9 (SOLD)
'93 300E 2.8