Absolutely it's ok. Run it 50:1 you will be good. And yamalube is the best or amsoil full synthetic. If you go amsoil make sure you finish off the yamalube in the tank and then run premix amsoil. Amsoil is full synthetic yamalube is part synth. The both have special detergent to clean your powervalves. Don't run shit oil in a powervalve unit...you will crack the powervalve shafts.