Cat is typically longer life span before an overhaul is due.
Isx Cummins aren’t even suitable for boat anchors they are so worthless.
Detroit’s given they are the correct engine, you’ll find some that love them and some that hate them.
I’m a
cat guy, however I do like Detroit as well.
6nz is just a serial number of c-15’s. They are over rated if you ask me. Easy to make decent power with. There’s really nothing wrong with a good emodel
cat either. The bottom ends just aren’t as stout as say an accert engine.
I know nothing of Mack engines so I’ll bow out on that one.
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