1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 31Get this manual

1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 31

2-5 PERIODIC MAINTENANCE
GEAR OIL
Change initially after 20 hours (1 month) and every 100 hours (6 months) thereafter(1) Place the outboard motor upright on level surface(2) Place container under the lower unit
(3) Remove the lower gear oil drain plug before the gear oil level plug and drain the gear oil1