1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 231Get this manual
POWER TRIM AND TILT 8-2
SERVICE PROCEDURE
OIL LEVEL
To 12345check the oil levelThe motor should be raised to full-tilt positionLower the manual tilt lock lever 1Remove the oil filler plug 2If oil can be seen at filler plug level, the unit is fullIf oil level is low, refill with the recommended oil