What's The Best Way To Break-In A New Engine ??
The Short Answer: Run it Hard !
Nowadays, the piston ring seal is really what the break in process is all about. Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension. Ring tension is necessary only to "scrape" the oil to prevent it from entering the combustion chamber.
If you think about it, the ring exerts maybe 5-10 lbs of spring tension against the cylinder wall ...
How can such a small amount of spring tension seal against thousands of
PSI (Pounds Per Square Inch) of combustion pressure ??
Of course it can't.
There's a very small window of opportunity to get the rings to seal really well ... the first 20 miles !!
Not quite. The engine is technically broken in when you get the car. The moly rings that they use now seat very quickly and every G8 hits a chassis dyno at the factory. What you are breaking in is the rest of the drivetrain. Besides, if the best way to break a car in was to beat on it for the first 20 miles, wouldn't the owner's manual state that? Read any installation instructions for differential gears and they give specific instructions on break. Hammering on it in the first 20 miles is not among them.Well if the car had less than 20 miles on it, the best way to break it in is to run it hard. This is always a controversial topic though.
If that was his car then fine. Everyone has the right to drive their cars the way they feel but if that wasn't his car then he was wrong for abusing the car like that. If he was a dealer beating on a car that is for sale I hope Pontiac or his boss sees this and hopefully fires him.Well if the car had less than 20 miles on it, the best way to break it in is to run it hard. This is always a controversial topic though.
9 miles?? I would have went ape-$hit if I got my car back and it had 9 additional miles on it. That is an obvious sign of them taking it out joyriding. You should have confronted them about it.hmm my car was in the dealership for 3 days while they fixed the bumper that they scratched on the show room floor. It went in with 602 miles and when I picked it up it had 611. How the hell did they put 9 miles on it?? They better not have been taking it out for a ride.