Fished with my son-in-law this week end. He has a 70 hp Mercury approx 1997. Engine began emiting a "beep" approximately every second. Sounds like the noise our garbage truck makes when it is backing up. The manual clearly says that this means low oil so and the reservoir was low so he did fill it but the beep continues.<br />He ran it all week end, perhaps an hour total in many small trips, and it runs fine. <br />Is this an electrical glitch? Perhaps a mechanical float in the reservoir that is stuck? or does this indicate an oil pressure problem?