I bought a low hours Yamaha 2000 C60TLR and know the oil mix is 50:1, but how many oz of oil per gallon is 50:1 for this engine I am told each manufacturer has a different mix of oz per gallon to get 50:1 for their engines.? I bought an oil mix bottle, but stupidly did not read the data on it and it is for Merc and Johnson and not Yamaha. Thanks for the help.