After investigation Diamond team advised not to operate diamonds at high temperatures.
Odd, that one.
Sabena (now CAE Global) Flight Training here in Arizona (hot as RUH) operate about forty of these aircraft, and have for the last three + years.
No specific engine problems due to heat that I've heard about, and these airplanes fly a lot every day.
No special airframe issues, either....except students who run the airplane into other parked airplanes.
