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About the break-in period -- run it hard NOW. It will seal the piston rings, etc by heating them up.
There's a lot of info on this on the internet. The old-school advice on taking it easy for 1,500 miles is outdated.
Today's engines are built to exacting tolerances. I'm no engineer, but I did the research.
GM still says take it easy because their lawyers don't want you crashing your new car, and they're on the hook if you throw a rod or blow a gasket under warranty!
There's actually a guide on-line for how long to run it hard, how long to run it easy, etc.
The key is to NEVER run her hard when the engine is cold -- wait until the oil temp is around 200 degrees.
And vary the load on the engine for the first 1,500 miles.
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