Engine and Drivetrain Engine AMG-built 5,439-cc SOHC 24-valve V-8. High-pressure die-cast alloy cylinder-block, alloy heads. Net power 342 hp @ 5,500 rpm Net torque 376 lb-ft @ 3000-4,300 rpm Compression ratio 10.5:1 Fuel requirement Premium unleaded, 91 pump octane. Fuel and ignition system ME 2.8 engine management. Integrated sequential multipoint fuel injection and phased twin-spark ignition includes individual cylinder control of fuel spray, spark timing and phase, and antiknock. Two high-energy ignition coils and two spark plugs per cylinder, with 100,000-mile spark plug intervals. Electronically controlled throttle. Intake system Magnesium 2-stage resonance intake manifold increases the intake runner length at lower rpm for improved response. Transmission Electronic 5-speed automatic with driver-adaptive control. Touch Shift allows driver to manually downshift and allow upshifts by nudging the shift lever to the left or right from the Drive position. Display in instrument cluster indicates selected gear range. Driver-selectable winter mode starts vehicle moving in 2nd gear or a special second Reverse gear to help improve takeoff on slippery surfaces. Display in instrument cluster indicates selected gear range. Rear axle ratio 2.82:1 * MSRP includes $665 transportation and handling charge and excludes all taxes, title/documentary fees, registration, tags, Mercedes-Benz Dealer prep, labor and installation charges, insurance, optional equipment and accessories, certificate of compliance or non-compliance fees, and finance charges. Actual prices may vary by Dealer.