Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 196Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 196

GEAR HOUSING
Draining and Inspecting Gear Housing Lubricant
1Remove "OIL" (fill) plug and "OIL LEVEL" (vent) plugLet gear housing lubricant drain into clean drain pan
NOTE: 2000 model year and later outboards have upper and lower water drain holes

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