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    “Oil level” plug vs “vent” plug on lower unit of 2003 90hp Mercury

    You were right, great tip everyone should know otherwise people will install a new washer on top of it. Thanks! I found out my 2003 is one of the few with 2 vents at top of lower unit. So weird. If anyone else has this issue, open both vent plugs (the one on right is named “oil level”) to...
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    “Oil level” plug vs “vent” plug on lower unit of 2003 90hp Mercury

    Help a Mercury newbie. Changing lower unit oil and open the drain plug, then open the vent plug above to let it drain faster. Next to the vent plug is yet another plug labeled “oil level”, what’s that about? Please be detailed. Also, none of the plugs I removed had gaskets. Is that normal for a...
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