Let me just say BMW dealer IS NOT BMW engineer.

And saying "run the engine hard, nothing can happen" is pretty incompetent, engineer or not.

In fact Dinan states this clearly in their FAQ:

Will the chip hurt my engine? Yes and no... We work very hard engineering our products to work within the limits of the engine components. On the other side, nothing is free and we are asking the engine to do more work and that will increase wear.

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F01 750i Daily driver
E92 m3 Toy car
D2 S8 Race/Toy car