Half a day sounds a bit excessive. You can pull
oil yourself and send for analysis if that is,enough for you.
I would ask what they ck. For that much time should be able to ck
compression of all cylinders, pressurize
cooling system to ck for
leaks, adjust valves and more.
You can pull
oil for analysis if that's enough for you.
What is the name of the
boat? Might know some
history of it.