Nitro does not equal model engine fuel. Model engine fuel is methanol, synthetic oil, castor oil, and nitromethane. Castor oil is the only ingredient in nitromethanol fuel that turns into a dry lubricant when the engine is overheated.
Most model engines, particularly the ABC engines with interference fit pistons (no rings on these puppies) are hard to destroy from overheating. As the engine gets hotter, the taper in the cylinder disappears (cylinder expands) meaning less compression, less power, less friction, less risk of seizure.
Overlean is based on mixture setting not on lubricant qualities. Don't mindlessly repeat what's on a label without fully understanding what it means especially when you are recommending something that can destroy someone elses engine very easily.