As I stated this morning in the other post, the 52 and 53 are used in 117.981,2,3, and 4, US motors. I was looking at european info last night and the 52 and 53 are only used in 116 motors in those models, with the 56 and 57 being used in 117 engines.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician