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Once you start building cars like this you are not looking to get 100k miles out of it. Just like /u/Fluffy_Waffles said you can build an engine to rev really high. All the internals of the engine are much harder and have closer tolerances than what you get from the dealership. [Here](http://www.team-bhp.com/forum/attachments/technical-stuff/206987d1255189795-pics-video-red-bull-formula-1-car-assembly-engine-fire-up-mumbai-p1000873.jpg) is an extreme example of how tight the tolerances are in F1 racing. The gray box (bottom left) with hoses leading into the car is an engine pre-heater. It pumps hot fluid through the cars coolant system to heat the engine up before they even “turn the key” because with out the metal expansion you would detonate the engine. These babies rev well into the 9000s and they only get a limited number of engines per season (3 I think). So yeah it is bad for it but they also engineer the engines and know their limits.