Suzuki DF25/DF30 Four Stroke Service Manual, Page 31Get this manual
2-4 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 cap1 Oil filler cap