Quote:
Originally Posted by JohnS_Rosamond
On the hard break in versus soft:
I was under the impression that the "softer" break in was to save the rings and cylinder bores (more even wear). If you're hard on the engine to "break in" the VVT units, you are by default sacrificing the cylinders. I would rather save the cylinders get the CEL and wait for top end to work itself out.
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I don't think it's a big deal for the rings or cylinder bores. Engines can be broken in within a couple of hours on a dyno, and not suffer any reliability problems. It goes on all the time. You have to remember that you're breaking in everything on the car. Brakes, clutch, tires, struts, transmission, diff, chassis etc..
Just as an example, a new clutch can come with a 500 mile break in.