2003+ Suzuki DF9.9/DF15 four stroke outboard motors service manual, Page 30Get this manual
PERIODIC MAINTENANCE
6Pour the recommended engine oil, then install the oil filler capNecessary amount of engine oil: Oil change only: 1.0 (1.10.9 USImpqt) Oil filter change:1.1 (1.21.0 USImpqt) Recommended oil:stroke motor oilAPI classification SE, SF, SG, SH, SJViscosity rating SAE 10W-40 7Start the engine and allow it to run for several minutes at the idle speedTurn off the engine and wait for approxtwo minutes8Remove the oil level dipstick and wipe it clean9Insert the dipstick fully into the dipstick hole, then pull it out
10Oil level should be between the full level hole (Max and the low level hole (Min If the level is low, add the recommended oil to the full level holeFull level line