Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 43Get this manual
Maintenance 7) Inspection of Gear Oil Quantity
12Tilt down outboard motor down to the vertical positionRemove upper oil plug and check level of gear oil in the gear caseOver flow of some oil from plug hole as plug is removed indicates that gear case is filled with specified quantity of gear oilGEAR
Add recommended gear oil to specified level if it is LowOIL
2Gasket
Do not reuse
Gear OilHypoid Gear Oil APIGL-5 SAE# 90