On D3 4.0TDI is the one to avoid, intake manifolds are known to brake and send bits in the engine which destroys the engine. Not cheap to replace as preventative maintenance before they brake either at over £1000 each.
Any D2 has a risk of gearbox failing unless it's been replaced or rebuilt recently.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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