These are not pre-run engines, imagine 50,000 engines run for a couple of hours each, manufacturers will NEVER pay that kind of fuel let alone a running facility that tests and break-in each and every engine..
What they do while manufacturing, the surface finish of the cylinders and pistons are diamond cut, work-hardened, and most likely burnished. Burnishing is very similar to polishing but no material is removed in this process and leaves a flawless surface. This also minimises metal particles during operation.
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