Marine
Before you discount the 3.0's you really should drive one. You'll be surprised at the power, and IMHO they are far less problematic than the V8's
I just cannot understand why anyone needs a bigger engine unless you are towing a heavy load...we routinely have 4 adults in the car and never feel the need for more acceleration.

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BMWCCA # 12660
14 GLK 350 M/B (hatefull POS gone)
05 CLK 500 AMG Cabrio
07 530xiT
09 Boxster