DICTIONARY OF AUTOMOTIVE TERMS - "Mm"

Mm

Millimeter. 25.4 mm = 1 inch.

mmf

Acronym for Magnetomotive force

MM oil

Motor Medium oil used in engines that work under moderate conditions where there is moderate loads, occasional high speeds, and a normal amount of dust.

MMT

Methylcyclopentadienyl Manganese Tricarbonyl.