Back to an oil question . This is my first gas. Dl-50. It is used , and has about 30 flights. The guy i bought it from says that after break`in he has been using Amsoil syn at 100:1 ratio. I want to run a good syn. oil but that seems kind of lean. He said he has it setup to run rich. what does he mean. If you are running with that little oil would running the motor rich make up for the lack of oil in the mixture. Could you guys name some good syn. oils with low carbon build up on top of the piston and what ratio syn. volume per gallon should be run at. thanks