I am a total newbie to the whole boating thing. I just bought a 14'
Starcraft Aluminum Deep V with a 1973 Johnson 25 Horse recently and was
wondering a couple of things.

What kind of fluids do I need to perform oil changes, what is the fuel
to oil ratio? I think it would be 50:1, but not sure. Any other
information on this particular year/motor

The motor runs great, runs on 1 pull every time, and has good
compression. The only thing is that from time to time the guy that I
bought it from said the oil in the lower unit will get water in it.