At 17 qts it must be a 6.7l cummins?
oil changes can extend out to around 18000 miles depending on if its long distance or more local and the oil filters can be bought on line through fleetquard part number is
LF3970 or can get at semi dealers and napa but I don't know there number but anyone should be able to cross the lf3970 to there brand, don't forget the fuel filters.
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