1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 29Get this manual
2-3 PERIODIC MAINTENANCE ENGINE OIL CHANGEENGINE OIL FILTER REPLACEMENT ENGINE OIL Change initially after 20 hours (1 month) and every 100 hours (6 months) thereafterENGINE OIL FILTER Replace initially after 20 hours (1 month) and every 200 hours (12 months) thereafter
NOTE: Engine oil should be changed while the engine is warm When replacing the engine oil filter, change engine oil at the same time1Place the outboard motor upright on level surface2Remove the oil filler cap