Factories are very conservative about setting redline. The car theoretically could rev to 8k and wouldn't see problems unless it was left there for a very prolonged period of time. And for revving to 7.5k being very bad for the engine, where did you pull that out of? That is the most incorrect statement i've ever heard. You would cause more wear and tear by redlining the motor every time but the engine was built to withstand that. Even if you tracked your car all its life and revved it to the red, other components would start failing before the motor suffers catastrophic failure. That is if you've been doing proper maintenance.
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