How many miles is the actual breakin period for a 70cc? I have looked all over this small town for a synthetic oil. All I could find is Lucas semi-synthetic. Is this ok. Also I may be rushing things. I have used 2 tanks of gas at 20:1. The instructions said run about 2 tanks of non-synthetic for a couple of tanks, then synthetic at 40:1. I mixed some of this semi-synthetic. I used 1 1/2 bottles of 50:1. I figure that would be about 38:1. Am I way off the mark?