I recently bought a used 2 stroke Kawasaki jet ski for my wife. The previous owner used only Quicksilver PWC Synthetic 2 stroke oil mixed with Yamaha ring free and non ethanol gas.We also have a 20' Chris Craft Seaskiff with a Johnson 150 Ocean Pro that I only use Johnson/ Evinude XD50 in. My question is that I would rather use just the J/E XD50 in the pwc instead of the Quicksilver oil and the ring free since my understanding is that the XD50 has additives that do about the same thing, good or bad idea?