In the summertime I use N20 at least once a week. Even if I'm not racing I'll use it for my own amusement. My stock motor just turned 200K, I've been spraying since about 150K. This car is my only means of transportation and I expect it to last a quarter of a million miles. As long as your motor is tuned for it you should be fine. Even my T-5 was holding up untill a few thousand miles ago.
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