Mercedes-Benz SL-Class 2008 Owners Manual - Manual (Page 455)

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Technical data
Electrical system
Model SL 550 SL 600 SL 55 AMG SL 65 AMG
Generator (alternator) 14 V/180 A 14 V/180 A 14 V/180 A 14 V/180 A
Starter motor 12 V/1.7 kW 12 V/1.7 kW 12 V/1.7 kW 12 V/1.7 kW
Starter battery 12 V/35 Ah 12 V/35 Ah 12 V/35 Ah 12 V/35 Ah
Battery for electrical consumers 12 V/70 Ah 12 V/70 Ah 12 V/70 Ah 12 V/70 Ah
Spark plugs NGK PLKR7A NGK IFR6QG NGK ILFR6A NGK IFR6QG
Electrode gap 0.031 in (0.8 mm) 0.028 in (0.7 mm) 0.031 in (0.8 mm) 0.028 in (0.7 mm)
Tightening torque 15 – 18 lb-ft
(20 – 25 Nm) 18 – 22 lb-ft
(25 – 30 Nm) 18 – 22 lb-ft
(25 – 30 Nm) 18 – 22 lb-ft
(25 – 30 Nm)