I have a 2001 Yamaha 200 OX66 that only has about 50 or so hrs on it. It is like new. I bought the boat after it was stored for several years. New injectors and she has been purring like a kitten ever since. Except for having to rebuild the three low pressure fuel pumps. That cost me a total of $30. Anyway, the original owner used full synthetic Pennzoil so I continued to use that. Now I need some more oil and I can't find full synthetic anywhere locally. What all do I need to do to start using a synthetic blend (Pennzoil XLF is everywhere) or a standard oil? What kind of engine damage, if any, will occur if I make the change? Thanks!!