a 24-valve head. The V8 and V12 were carried over with no changes. 300 SL and 300 SL-24 became SL 280 and SL 320 while 500 SL and 600 SL were renamed as SL 500 and SL 600. In 1998, R129 received the major cosmetic and technical updates with revised engines to include the V6, V8, and V12 engines from the new W220 S-Class. All of those updated engines had three valves and two spark plugs per cylinder. Model Range SL 280: (1993–2001), 2.8 L I6 SL 280: (1998-2001), 2.8 L V6 300 SL: (1989–1993), 3.0 L I6 300 SL-24: (1989–1993), 3.0 L I6 SL 320: (1993–1998), 3.2 L I6 SL 320: (1998–2001), 3.2 L V6 500 SL: (1989–1993), 5.0 L V8 500 SL 6.0 AMG: (1991–1992), 6.0 L V8 SL 500: (1993–1998), 5.0 L V8 SL 55 AMG: (1999–2001), 5.4 L V8 600 SL: (1992–1993), 6.0 L V12 SL 600: (1993–2001), 6.0 L V12 SL 60 AMG: (1993–1998), 6.0 L V8 SL 70 AMG: (1998–2001), 7.0 L V12 SL 73 AMG: (1995 and 1998–2001), 7.3 L V12 R230 (2001–2011) The R230, introduced in 2001, continues the evolution of R129 with smoother body design and new peanut-shaped headlamp design. The fifth-generation SL-Class featured a 'Vario Roof' retractable hardtop, as introduced on the 1996 SLK Class: Active Body Control (ABC) active suspension system, Keyless Go keyless entry and smart key, and Sensotronic Brake Control (SBC) electro-hydraulic power brake system. The SBC proved troublesome, and was later disabled by Mercedes-Benz in a large recall campaign due to the difficulties in modulating the brake effort. In 2006, R230 received a minor cosmetic update and revised engine options. The R230 SL underwent a significant facelift in 2008 featuring new and revised engines and a new front end that evokes the classic 300 SL with a large grille featuring a prominent 3-pointed star and twin "power domes" on the bonnet, the car also features new headlights with an optional "Intelligent Light System" and a new speed sensitive steering system. The SL 63 AMG replaced the SL 55 AMG. A high-performance version of R230, SL 65 AMG Black Series, was offered as a coupe only body type. A total of 169,433 SL R230s were ever produced. The most common model is SL500 (~100,000 units). The rarest is SL65 AMG with only 3,055 units (350 of which SL65 AMG Black Series). Model Range SL 280: (2008–2009), 3.0