How bad is too bad for engine oil leaking?

Already headache by only looking at the list above! Probably not go ahead buying it.

Also, the two TAMD72P-A-EDC engines are very smoky throughout the whole 40 minutes of testing.
When you testing you mean under load out at sea ? If not the 40 minutes have told you really nothing other than they run at fast idle and you have noted an oil leak and that’s it .
You need the boat testing under load at sea at full throttle for at least 10 minutes to determine the condition , by the sounds of it unless the oil leak is positively identified I would not take that chance .
 
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