I have a new GT it now has 500 miles I already bought a tuner longtubes off road H and catback. I thought about waiting till I hit 1,000 miles but couldn't resist plus my family owns repair shops and my dad worked for Ford usually if I have any problems the dealer still warrantees my car
There are so many theories about this, some of breaking in with agressive handling, others till (x) amount of millage and etc. What have always worked for me is I do a oil/filter change between 1000-1500 miles and then screw the warranty and let the modding begin!
On my old cars (subaru) I did noticed that the engine oil that came with it had a special addictive to help seal engine components. Dunno if it applies with Stangs.
. .
I would wait for at least 1000 or so miles. You can buy the tune, but in case there is something wrong from the factory with the car the last thing you want to do is tune it and then the dealership use it as an excuse to not cover something.
We've built up and tuned all of our AM Project Cars when they were brand new right from the Dealership. I don't think there is a single AM company car that wasn't tuned before it hit the first 100miles!
Needless to say, there's nothing wrong with tuning your Mustang right from the start. Just understand there may be drivetrain warranty issues if there was a problem. As others have stated above.
If you're really worried you can perform a compression test. If you've got a strong, tight, healthy motor i'd say let her rip.
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