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Depends on model year and market. Cat left the highway diesel market for a reason - buy a truck with a C15 with an engine serial number beginning with SDP, and you'll find out why, real quick.

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8y ago

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Neither Well I think CAT because it was a CAT that broke the roadtrain record in a CAT 600hp Kenworth 500!

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16y ago
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Q: What truck engine is better - Cummins or CAT?
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