1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 27Get this manual
2-1 PERIODIC MAINTENANCE
PERIODIC MAINTENANCE SCHEDULE
The chart below lists the recommended intervals for all the required periodic service work necessary to keep the motor operating at peak performance and economyMaintenance intervals should be judged by number of hours or months, whichever comes first
NOTE: More frequent servicing should be performed on outboard motors that are used under severe conditions
PERIODIC MAINTENANCE CHART
Interval Item to be serviced
Initial 20 hrsor month
Every 50 hrsor months I
Every 100 hrsor months I