Yamaha F6C Ower's Manual page 100

5) With the outboard motor in a vertical
position, and using a flexible or pressur-
ized filling device, inject the gear oil into
the oil drain plug hole.
Gear oil grade/capacity:
Refer to "SPECIFICATIONS," page 4-1.
6) When the oil begins to flow out of the oil
level plug hole, insert and tighten the oil
level plug.
7) Insert and tighten the oil drain plug.
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