1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 26Get this manual

MAINTENANCE
1Place outboard in vertical operating position2Place drain pan below outboard3Remove filldrain plug and vent plug and drain lubricant
aFillDrain PlugVent plug

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives