[ce4]

Well, that depends on the exact model/make. In Germany there's the term "vollgasfest" (full throttle proof) for cars and it means ability to e.g. empty the gas tank in the pedal-down position in one go without damage. Especially some of the foreign brands from the 70'/80's are known to overheat in such conditions and also some of the earlier turbos. Wear is of course increased under more load but i wouldn't regard it unhealthy for engine/transmission and co per se.