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I think it really depends on how hard you can push the car. I also don't think you can base it on whether you are advanced, instructor or even racer......... I have seen plenty of slow folks with those labels. Now I change the engine oil every track day/weekend in the e46 m3. I have a close track buddy that changes engine oil in an e92 m3 every three days with Blackstone and it looks fine. I would start with every three track days if you can really push the car.
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