At 18.5 (or about the time of the first service interval) the fronts on my 05 base were in good condition, the rears were in need of replacement but hadn't reached the danger point. At 22.5 when I sold the car, the fronts were still good, the backs had been replaced. This is under what I would call "spirited driving".
I'd be very surprised if you got much past 20K on the rears with MichPS2s.
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06 987S- Sold
Carrara White / Black / Black/Stone Grey Two-tone
05 987 5-speed - Sold
Midnight Blue Metallic / Metropol Blue / Sand Beige
06 MB SLK350- Lease escapee
Iridium Silver Metallic / Black
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