I just bought a 2000 kdx 200r, i want to run synthetic oil in the fuel. I bought some synthetic OPTI2 oil. There is no ratio on the bottle. It just says to mix the entire bottle 250ml/ fl oz for 22 litres or 5 gallons. There is no oil/fuel ratio scale on the bottle. If my calculations are correct then the ratio is approx 88:1 ! A few people i've talked to say to run 40:1 or 50:1! I guess i will have to add more oil, but it is quite expensive! I will have to add 2 bottles of the 250ml/8 fl oz bottles for 40:1. I would like to just add one but i'm scared the bike will run to lean and seize! Can you run a leaner mixture with synthetic oil than just normal oil.:think I hope adding the 2 bottles will not foul plugs (40:1). One of my friends says he justs adds a small bottle of yamlube to 5 gallons of fuel and has never had any problems? i'm confused. Need a little help here guys