Bought rebuilt `92 40HP Johnson in January....couldn`t use until now....cranked it up every other week....ran it yesterday in lake for about 2 hours and lower unit started making noise...brought home and removed lower unit drain plug....no oil or water, just a little grey grease with metal shavings on it. Was told to rinse out with mineral spirits and fill with Hybrid oil and this might help. Dealership that rebuilt it no longer in business....any advice from anyone out there?