Refer to the original equipment manufacturer’s operating manual for a complete list of maintenance requirements. Failure to comply with the procedures as described in the engine operator’s manual will nullify the warranty, decrease performance and cause equipment damage or premature equipment failure. Maintenance records may be required to complete a warranty request.
Basic Maintenance Procedure:
If the unit is operated in a harsh environment or fuel quality is questioned, replace every 250 hours instead of every 500 hours.
Source: MaintainX (Community Member)