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There was an L-10(liter) engine about 10 years ago but was replaced by the M11, which in turn was replaced by the ISM.
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That was helpful.
I've also come across in my reading something about a Cummins ISC? Is that also an obsolete engine?
What do all those IS_ letters actually stand for?
How important is the matching of the engine to the transmission type and number of drive wheels?