I am breaking in my Boss with conventional oil. Changed out the synthetic factory fill at 100 miles. Replaced with 8 qts. Valvoline 10W-40. Will run to 1000 miles and change again with the same Valvoline 10W-40. AT 3000 miles I will go back to synthetic. I am driving the car hard from the get go. Not shy about tach-ing it to redline. Trying to vary the rpms constantly. What do you guys do for break in?