My 335 has Oyster leather interior and still looks good after 3 years and 85,000 km. I use leather conditioner about once a year and wipe the seats if they get something spilled on them. I'll grab a few photos when I'm in the car next, but I'll say that there is a bit of darkening around the 'grains' of the leather surface. It doesn't bother me, but it could be considered 'dirty'.
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