My 2011 D5 exhaust tips go black fairly quickly also. I'm putting it down to the cleaning stuff and maybe the wax out the wash and wax I use turning dark with heat and dirt also. It's not the emissions as it was " too clean" on the MOT this week to register anything. I may try an alternative cleaning product. I think cleaning reguarly is also a must.
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2003 V70 D5 [163] SE - Sold at 188,000 miles.
2011 V70 D5 [215] Rdesign - currently owned.
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