Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 203Get this manual
Engine Mounted Oil Reservoir REMOVAL
2Disconnect LIGHT BLUE leads from their respective connections3Disconnect clear input hose to oil pump and plug off hose4Remove three bolts securing oil reservoir to powerhead and remove reservoir
NOTE: If oil reservoir contains oil, the clear oil hose going to the oil pump should be plugged upon removal to prevent oil spillage
1Disconnect input oil hose to oil reservoiraBoltsOil Pump Output Hose (Clear)