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The Cummins ISX has an expected life of 300K-400K miles. But that being said, there are many that last 500K easily, with proper care and maintenance.
Oil Change frequency is recommended by type of use. Change Cummins ISX oil every 35,000 miles if light-duty, every 25,000 miles for normal use, and every 15,000 for heavy duty use.
The oil system capacity on the Cummins ISX is 14 gallons. The recommended oil for the Cummins ISX is Valvoline Premium Blue Extreme Full Synthetic Engine Oil.
"Nothing is particularly hard if you divide it into small jobs." - Henry Ford