Even the turbo 5 cylinder is a bit much power for the (essentially) front wheel drive xc90.

The 5 is a real Volvo motor with a good AW trans.

The 6 is a real Volvo motor coupled with a very weak GM trans (stupid).

The 8 is a Yamaha motor. They are not without issues...

I'm happy with the T5 xc90. I'm thinking of buying a C70 before Geely starts making Volvos out to ToFu.