Mercedes-Benz SLK-Class 2008 Owners Manual - Manual (Page 449)

448
Technical data
Electrical system
Model SLK 280 SLK 350 SLK 55 AMG
Generator (alternator) 14 V/150 A 14 V/150 A 14 V/150 A
Starter motor 12 V/1.4 kW 12 V/1.4 kW 12 V/1.7 kW
Battery 12 V/74 Ah 12 V/74 Ah 12 V/74 Ah
Spark plugs NGK PLKR 6A Bosch Platin Y 7 MPP33
NGK PLKR 6A NGK IFR6D10
Electrode gap 0.031 in (0.8 mm) 0.031 in (0.8 mm) 0.039 in (1.0 mm)
Tightening torque 15 – 22 lb-ft (20 – 30 Nm) 15 – 22 lb-ft (20 – 30 Nm) 18 – 22 lb-ft (25 – 30 Nm)