From the very first time you start your engine, place your car on the ground and begin running it in 3-5 minute intervals, tuned “slightly rich” (factory setting) while getting the engine temperature up in the 180f – 200f range on a normal day. Every 3-5 minutes, shut the engine down & let it cool to the touch and then fire it back up again. Continue this cycle until you run it 15 minutes or so, and then bump up to 6-7 minute intervals. Vary the RPM’s and do not be afraid to get the temperatures in the low 200 range. What you want is heat cycling of the components without the incredible stress that comes with breaking an engine in when it is overly rich AND cold. After cycling the engine in this manner for about 20-25 total run time minutes, it will be ready for a fairly “normal” run. Run about 2 to 3 tanks of fuel through the engine while being “kind” to the engine and then you can let loose for some full speed action. Realize that this method goes against the old "idle on the box" routine, where you just let the engine idle continuously for 2 to 3 tanks of fuel. It WILL allow for gently breaking in your engine while getting used to your R/C controls, maneuvering, speed and distance needed to safely operate your new car. DO NOT run your car wide open (full throttle) during the break-in period (2 to 3 tanks of fuel). There will be PLENTY of time for that later. You should run the engine at "factory settings" for the first 2-3 tanks, as the factory settings are very rich (adds oil to the mix) which allows for good lubrication of ALL internal parts.