The 2006 BMW M6’s 5.0-liter V-10 is all aluminum, with four valves per cylinder, four hollow camshafts actuating the 40 valves, and a high-pressure Double VANOS stepless variable valve timing system equipped with its own hydraulic pump for faster response and operation. Designed to rev, the engine produces 500 horsepower at 7,750 rpm and 383 lb.-ft. of torque at 6,100 rpm. Redline is a lofty 8,250 rpm. A 12.0:1 compression ratio and a premium fuel requirement extract maximum power from the engine, which exhales through a low-back-pressure exhaust system, and each cylinder gets its own electronically controlled throttle to eliminate lag time and improve throttle response. Added sophistication includes ionic current knock control performed by the spark plugs themselves, which signal to the engine software when ignition timing must be retarded to eliminate detonation to control fuel consumption and emissions. A G-sensitive semi-dry-sump lubrication system ensures that oil returns to the main sump regardless of cornering forces, and the oil is cooled by a coolant-oil heat exchanger. Because BMW deems the V-10 inherently smooth, no balance shafts are necessary to quell vibration. Instead, the crankshaft incorporates two large counterweights to ensure silky power delivery.