The third-generation VK45DE V-8 (based loosely on the outstanding “VQ” V-6 engine range) — which launches the new Q from 0 to 60 mph (0 to 97 km/h) in 5.9 seconds — convincingly smashes the V-8 power in the Lexus LS430 (290 hp), Mercedes-Benz E430 (275 hp) and BMW 540i (282 hp). The high output comes largely from the lightweight-internals philosophy of the VQ 6-cyl. engine range; many internal components are either weight-reduced, friction-reduced, or both. Pistons are a lightweight design ...

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