How is the oil removed from the oil pan?
It is usually the sludge in the bottom of the pan that turns the oil black. It is from incomplete removal of all the old oil.
On my engine the old oil is removed from a hose and a ball valve on the bottom of the oil pan as you would a car.
Sometimes the dipstick tube oil removal doesn't get it all out.
SD
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If you can't repair it maybe it shouldn't be on the boat
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