Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 212Get this manual

GEAR HOUSING
Filling Gear Housing with Lubricant
IMPORTANT: DO NOT use automotive lubricant in gear housingUse only Quicksilver Gear Lube

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