The low oil sensor is not "seeing" the oil in the tank...(mine does this when I crank it,, the low oil light stays on).. It uses plenty of oil,,I quit worrying..- -don't feel like taking the oil system apart..
Get one of these.. I have one for every outboard I ever owned..they DO come in handy...
Mercury Outboard Manuals by Seloc 1965 2014
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