Guys, I'm no engine expert, but i do have 3 DL's. The oldest is a version 1 engine with at least 12 - 15 gallons on it now, the others probably have about 4 - 5 gallons each through them. I just wanted to share my experiences on break in and oil.

I simply ran all motors on 50:1 synthetic from day 1, and are on the same mix now and have proved super super reliable, powerful, tractable and a joy to own

As for break in...just make sure the motor ticks over reliably and then go fly the thing...just be aware of fuel consumption when new. I got 8 minutes max on a 26 ox tank when the motor was new, now 26 oz is good for 14 minutes with some left in reserve.

Just my 2c...