i have heard conflicting info on how to break in a nitro engine. i have been told run 5 tanks through it doing semi circles, let it idle in one spot ( air cooled engine, do not advise), i have also heard you nedd to run about 15 tanks through to break it in properly. i think the main thing to do is get the engine hot enough on each run and to keep a steady temp of about 210-250 degrees F. this info comes from a long time friend who has been in the hobby about 10 years. i am going to follow his way of breaking in the engine and go from there. i would say at least 8-10 tanks making sure the engine temp stays within limits. too hot and the engine will ceize and too cold you could blow a conrod. just my little bit of 3rd party info that i deem valuable to a noob since i am one as well. get as much info as you can from friend and this forum and happy bashing