Mercedes-Benz R-Class 2007 Owners Manual - Manual (Page 536)

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Technical data
Electrical system
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Electrical system
Model R 350 R 500 R 63 AMG
Generator (alternator) 14 V/150 A 14 V/180 A 14 V/180 A
Starter motor 12 V/1.4 kW 12 V/1.7 kW 12 V/2.2 kW
Battery 12 V/70 Ah 12 V/95 Ah 12 V/95 Ah
Spark plugs NGK PLKR 6A NGK PFR 5R-11 NGK T20036N
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) 15 - 18 lb-ft (20 - 25 Nm)
Model R 320 CDI
Generator (alternator) 14 V/220 A
Starter motor 12 V/2.2 kW
Battery 12 V/95 Ah