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2019 Bullitt with 15k miles. I track it 2-3 weekends per year. Manual/book says to run 5w 30 oil for track. Not practical for me to change oil between 5w20 street and 5w30 track, so I was told it's ok to run 5w30 all the time, just warm up the engine good before going out, and I do. The car...
I've come to the conclusion that a proper break-in involves putting the motor under load withing the first 10 minutes of start-up. From everything I've read it seems this comes with the most success and least side effects (glazing from idling too long or revving without the car under load)...
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