Well I have about 170 miles on it and according to everyone on here, break in period is between 50 to 500 miles and anywhere from a 16:1 oil mix to 100:1 so I'm not quite sure. Right now, I'm using between a 18:1 to 24:1 mix. I put in 24 but add a little bit here and there to make sure it's oiled well because of the break in descrepancy.