Mercury 10 EFI FourStroke Installation, Operation & Maintenance Manual page 100

5. Inspect the drain plug seal and replace it if damaged. Lubricate the seal
on the drain plug with oil and install. Tighten to the specified torque.
Description
Drain plug
FILLING THE CRANKCASE WITH OIL
IMPORTANT: Do not try to fill the oil level to the top of the operating range
(upper hole). The oil level is correct as long as it appears in the operating range
between the upper and lower hole.
1. Position the outboard in a level operating position.
MAINTENANCE
63034
90
4537
Nm lb‑in.
23.7 –
lb‑ft
17.5
eng