My driver's side lock is obviously worn out compared to the passenger's side lock, and sometimes it won't give me the key back. Very frustrating. One of these days I'll swap the lock cylinders around.

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2012 Volkswagen Passat TDI - 103,000 miles
2004 Volkswagen Touareg V10 TDI - 160,000 miles
2003 Ford F-350 PowerStroke 6.0 -- sold
1987 Mercedes-Benz 300SDL -- 307,500 miles -- Retired
1991 VW Jetta GL ECOdiesel -- 429,531 miles -- RIP
2000 Volkswagen New Beetle TDI -- RIP
1987 Mercedes-Benz 190D 2.5 Turbo -- sold