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I'm not intimately aware of all the engine options in the XC90, but I'll take a stab.
As I understand it, the V8 is designed (and built?) by Yamaha. I do not believe that is a bad thing. IMO, Yamaha builds a quality product. Logic would dictate that the extra displacement of the V8 would mean that it is strained less than a lower power/higher boost motor in the same vehicle. I think this may not really be the case with this V8 as it would appear to be a screamer just like the rest.
If I'm not mistaken, the turbo 5cyl has already been replaced by the new 3.2L 6cyl (normally aspirated) for 2007. Yes, the alternator is tucked up under the intake. It doesn't look at all DIY-friendly, but that's what it took to get a 3.2L six in the space of the old 5cyl. On paper, it looks like a sweet engine. Given the choice, I would definitely choose the new six over the old T5 or T6.
There was a short article about the new I6 in Automotive Engineering a number of months back. If it means something to you, I could dig it up, scan and email it...
-Will
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850 / Mini
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