A good rule of thumb, at least with me, is to do oil changes every 4 track days or every 3k miles, whichever comes in first. Another good thing to do that is often overlooked, is to do brake flushes once a year. I visited my buddy Fernando that owns Backyard Auto for my oil change and brake flush.
Brake fluid is corrosive. Eventhough the brake lines are a closed system, they do get dirty and can significantly impair brake performance. If you don’t track your car its still a good idea to do yearly brake flushes. Its maintenance that will keep your car running forever and avoid serious complications later.
I use Motul dot 5.1 brake fluid for my M3. Motul dot 5.1 does the job for the track abuse and normal city driving. My experience from the track, is the Motul performs exceptionally well and never had them boil. The brake pedal feels consistently firm and great bite. I can modulate the brake pedal nicely to adjust my braking distance. Only at COTA is when I had brake fade issues but I think that track exceeded the stock brake system. If I had race brake pads and fluids then it wouldn’t be an issue. Motul dot 5.1 is little more expensive than normal dot fluid but its way cheaper then higher temp brake fluids. For me its the perfect match for track abuse and city driving. The M3 only required one bottle for the stock brake system.
While I was doing waiting, I notice within one week I managed to crack my lip. Comes with the territory when tracking. Unfortunately during TX86 Day, there was a cone in the middle of course and I was unable to avoid it. The lip is still intact but you can see the crack is visible. Battle scars.