Well, regarding reliability,the turbo's is a part which breaks down within 130-180.000 km.
Which means within 6 years or so it/they need to be replaced.
It's not cheap, especially the modern turbo's.
What might be worse is when these breaks down, and you drive with it, the Hole engine can be destroyed!
So surely the NA 6 is more durable in the long run, but with these bullshit clima regulations, turbo's and downsizing is a must, sadly!
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3 series: E30: 89 325i, E36: 92 325iC, 94 320iC, 96 320i Convertible, 94 320iaC, E46: 99 320ia, E90: 06 318i Le mans, E91: 07 318dt
5 series: E39: 97 520ia, 01 530Dat, E61: 09 520Dat
X series: E83 05 X3 2.0d, E84 10' X1 2.0 X-drive DA, F25 13' 2.0da X-drive.
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