The biggest issue with 4.0TDI is intake manifolds braking down with age and sending bits into engine which kills engine. In most cases engines are not repairable and not economical to replace which means cars are written off. Intake manifolds cost over £1k each so not economical to replace as preventative measure either. In my opinion warranty is a must if you go for 4.0TDI unless you can find one which had manifolds replaced 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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