you will be surprised. leather is not naturally black but is dyed this colour. As it is a natural fibre the oils, waxes and pigments in the shoe polish will actually dye the leather on your seats. give it a try before you go and spend hundreds on replacing the leather.

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E90 318i 2007 N46 2.0 Manual
E53 X5 2004 M54 3.0 Sport Auto
E83 X3 2004 M54 2.5 Auto