Engine: M10, M20, M20B25, M20B27, M21, M30, M30B34, M30Tur, M40, M41, M42,
M43, M43TU, M44,
M47, M47T2, M47TU, M50, M51, M52, M52TU, M54, M56, M57, M57D25, M57D30, M57T2,
M57TU,
M60, M62, M62VAN, M67, M67TU, M70, M73, M88, N40, N42, N45, N46, N52, N62,
N62TU, N73, S14,
S38, S50B30, S50B32, S50US,
REPLACING ALL SPARK PLUGS (N42, N40, N46, N45, N52, N52K, N51)
Special tools required:
12 1 171
12 1 200.
Necessary preliminary tasks:
Switch off ignition
Remove ignition coils.
Unscrew spark plugs with special tool 12 1 171.
Installation:
Tighten down spark plugs with special tool 12 1 171a