Honda Marine BF75A Owner's Manual page 116

10. MAINTENANCE
OIL LEVEL CHECK PLUG
Gear Oil Level Check
I. Position the outboard motor vertically.
2. Remove the oil level check plug, and
verify that oil flows from the oil level
check hole. If no oil flows out, contact
your closest authorized Honda Marine
dealer.
The oil contaminated with water will
be milky colored. If the oil appears
abnormal, consult with your closest
authorized Honda Marine dealer.
3. Install and tighten the oil level check
plug securely.
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