I recently bought a new boat...well new to.me anyways. Its got a 1981 evinrude 35go motor on it.was wondering what kind of oil would be good to run in it and what kind of lower unit oil would be.good. before I had an old 1955 merc 6hp I just used to.run the Wal-Mart 2 cycle oil in it and my dad had some merc lower until oil he let me have. So I'm wanting to take better care of this motor and need some advice