1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 30Get this manual
PERIODIC MAINTENANCE 2-4 (3) Screw new filter on by hand until the filter O-ring contacts the Mounting surface(4) Tighten the filter 34 turn from the point of contact with the mounting surface using an oil filter wrenchEngine oil filter14 (1.4 kg-m, 10.0 lbft, 34 turn(5) Install the PORT side lower cover6Install the gasket and the oil drain plugTighten the engine oil drain plug to the specified torqueEngine oil drain plug13N (1.3 kg-m, 9.5 lbft
Do not re-use gasketAlways replace with new gasket