Cummins B and C Series engines should have initial valve adjustments at 24,000 miles, then every 48,000 miles afterward. Never use caustic cleaners in the cooling system. Aluminum components will be damaged. Cummins recommends that fuel filters be changed at least every other oil change. Do not drain an excessive amount of fuel out or re-priming the fuel system may be required to get engine started.
Midrange engines require SG classification due to sliding cam followers.
Fill the oil filters with clean lubricating oil when changing the engine oil to ensure immediate bearing lubrication when restarting the engine. Failure to pre-lube the oil filter may cause bearing damage. Cummins requires that a fuel-water separator be used with all '91 N14 and L10 electronic engines. Cummins recommends that a fuel-water separator be installed in the fuel supply on all other engine series. Fuel-water separators will remove water in diesel fuel, preventing damage to the fuel system.