1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 367Get this manual
13-31 DF40DF50 "K1" (01) model
OIL CHANGE REMINDER SYSTEM
This system informs the operator of the time for replacing ENGINE OIL on the basis of the recommended maintenance scheduleWhen the total motor operating hours have reached the preprogrammed hours; On the tiller handle model, the buzzer will begin series of double beeps for approx1 minute On the remote control model, the "OIL" lamp will flash, and the buzzer will begin series of double beeps if engine is not running (but ignition switch is ON)The above mentioned indication will repeat until canceling system activationINDICATION OF SYSTEM ACTIVATION