Remember that older, especially mechanical, engines were designed to operate differently than newer electronic engines...they do not like to pull down low like new engines can and the result is smoke, poor economy, lack luster performance and shortened engine life. Trust what Cummins recommends. They have all of the data to back up there recommendations....for the most part.
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2007 Haulmark 3329DS, Freightliner Coronado Chassis, 515hp Detroit, Meritor Freedomline 12speed Autoshift, 10kw Generator, In-motion Satellite.
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