R230-based, 2008–2009 per the Mercedes-Benz archive: the M275-derived 5,980 cc twin-turbo V12 at 493 kW / 670 PS / 661 hp at 5,400 rpm, torque electronically capped at 1,000 Nm / 738 lb-ft; AMG SPEEDSHIFT 5-speed automatic; the folding hardtop replaced by a fixed carbon roof.
Extensive carbon panels (bonnet, front wings, bumpers, boot lid) with wide-body treatment, approximately 250 kg lighter than the standard SL 65 at 1,870 kg DIN; retractable rear spoiler; 320 km/h limited; 0–100 km/h 3.8 s; 390 mm / 6-piston front, 360 mm / 4-piston rear brakes; launch pricing ~€330,000. The most powerful Mercedes road car of its time.
The twin-turbo V12 Black Series and the most powerful Mercedes road car of its time. Carbon-panel originality, V12 turbo health and provenance are the defining factors.