Mercedes-Benz M-Class 2006 Owners Manual - Manual (Page 491)

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Technical data
Electrical system
Model ML 350 ML 500
Generator (alternator) 14 V/180 A 14 V/180 A
Starter motor 12 V/1.4 kW 12 V/1.7 kW
Battery 12 V/70 Ah 12 V/95 Ah
Spark plugs NGK PLKR 6A NGK PFR 5R-11
Electrode gap 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)