*Oil, fuel and water filters should be changed at every oil change.
**If engine is equipped with an optional coolant filter, it will need to be replaced on the same intervals as the oil filter.
For additional details download the ISB RV Maintenance and Operation Guide.
When it's time for maintenance, be sure to visit your authorized Cummins distributor or dealer.
Cummins ISB is fully compatible with long-life coolant/antifreeze formulas which allow changes out to 6 years. Follow maintenance guidelines recommended by the manufacturer for safe use with extended service intervals.