How much oil in bilge? Do you no where it came from? Did you try adding a quart, and see if it then shows on dip stick? When was the last time the oil was checked? Need alot more info, on history of boat.
What U have there is a CHEAP GM oil pan.
Volvo's been putting them on for YEARS!!!
Usually no fix, replacing is the only way to go.
My 32 Bayliner, with twins, my 28 Bayliner and a friends 27 all with Volvo's
New oil pans all of them
