Originally Posted by willk
When you remove the cowl, you should be seeing something like this
so Mark I Eyeball is your actual gauge. The level indicator you refer to is more likely a "Low Warning" alarm. Best not test/rely on this. Keep her maxed on oil. The last owner probably meant that the alarm tended to go off prematurely - on say a half tank instead of a quarter. A lot of these systems do that. Unless it forces you into a "limp home" mode, it's not a big deal. I used to check oil levels after every tank full of fuel - that kept me right...
Just curious. I have an outboard mercury engine on my boat, I think it's from 1995, 75 HP. The oil reservoir looks almost identical. I was curious, it was worked on in the shop this year, and I think they might have missed something. There is the main fill location with the screw off cap and seal, and then a smaller hole (can be seen in your picture) back from that toward the prop side of the engine. Is that supposed to have a cover or plug in it? I noticed with a full oil reservoir and engine tilt I am leaking oil. Is that a vent meant to be open? Or did the shop misplace the cap? Or perhaps I just put too much oil in the boat?
Any help would be greatly appreciated.