Ended up with about a tablespoon of lower unit oil in my engine oil resevoir for my 2011 125 opti. Let's just say this:don't use empty oil jugs to dispose of your old lower unit oil and leave them lying around.... So should I siphon all the oil out? Or would it be sufficiently diluted it shouldn't cause a problem. There is about 1 tablespoon of lower unit oil in a gallon of Opti oil. I am thinking of draining it in the spring.
Another lesson learned!!!