Quote:
Originally Posted by yal
Personally I think the number one problem is excessive acceleration and abuse during the first 5k miles that causes problems in the long run. Some people really go at it with their new cars after a very short while
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I'm in the opposing camp. You need to be running that engine at half-throttle for short bursts when it's new. You should be hitting full throttle for short bursts by 1K miles. This increases the pressure behind the rings, helping them wear into the cylinder bores as they should.
Long before 5K miles, you should have your foot into it for long stretches.
But as I've only broken in about a dozen new engines in my life, I don't have all the answers. Note that the hardest working parts in your engine are in the valve train, and these parts don't care one bit how far you press the pedal.