I have a small amount of coolant in my bilge AFTER running the boat. Is is OK to to add some Stop Leak to the coolant to try and seal it up? It's a 1998 Mrcruiser 5.7 with 300 hours and closed cooling system. Can't detect the leak.
First, send your oil out for analysis to make sure you aren't getting coolant in the oil.Next pressure test the coolimg system. You can buy a pressure tester or have a yard perform the work. About 15 PSI oughta show any leaks.
( How much are you leaking, anyway?)