Nearly 1 year and 8K miles on mine and only issues have been the stupid battery draining several times. As far as the diesel engine - its fantastic and getting better gas mileage all the time. Averaging 22.6 with mostly stop-go city driving.

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09 E70 35d (Space Gray/Tobacco)
08 Audi RS4 Cabrio (Sprint Blue/Silver)
2010 Audi R8 V10 (Velvet Purple/Black-White)