Quote:
Originally Posted by BGM
Here is the data supporting (or not supporting) long-term durability of those 2 motors:
1) 35d: None
2) 50i: None
What we do know:
1) Non-aspirated I6: BMW's bread and butter and is bullet-proof
2) Non-aspirated V8: Not as reliable as I6
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Agree with your conclusion, but let's call them naturally aspirated, as compared to forced induction. 
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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