2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 34Get this manual
PERIODIC MAINTENANCE
ENGINE OIL CHANGEENGINE OIL FILTER REPLACEMENT ENGINE OIL Change initially after 20 hours (1 month) and every 100 hours (6 months)ENGINE OIL FILTER Replace initially after 20 hours (1 month) and every 200 hours (12 months)NOTE: Engine oil should be changed while engine is warm When replacing engine oil filter, change engine oil at the same time1234Place outboard motor upright on level surfaceRemove oil filler capPlace container under engine oil drain plugRemove engine oil drain plug and gasket to drain engine oil