Many install remote oil filters to make them more accessible.
I would check the lowest part of the boat as far back as you can go. It will discharge through one of the through-hull fittings above waterline. You 'could' count the number of through-hull fittings, then go inside and trace the hoses connected to each through-hull fitting back to it's source. These should be slightly different than the fuel, water and holding vents. I have one for each sink, as well as each bilge pump, the engine hatch drains and at least one draining locker.
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