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Driving a new car slow allows the owner to understand it. Remember, your the first real life driver. If it has somwthing wrong you'll hear it, feel it, and stop before catastrophic failure. I've seen idiots at dealers do a prep and literally add break fluid and oil and ruin motors.
Also, just like one person says it has to do with the rings and preventing honeing. You know.how hot your motor gets at 6k rpms? The transmission and rear end are moving quickly and are being heated straight off the line and with having thousands being assembly line built you don't have.time for the tedious quality control that you have building race motors. I recommend following the manual for warranty reasons, assuming shit hits the fan early.
I suggest just drive easy. You ever see how a horseshoe is made?(maybe bad example) you heat it, cool it, heat it, cool it etc. After a while what happens ( internal engine is hotter than 200* BTW)? It shapes the metal. As far as liability goes assume the dealer like I mentioned above didn't check the oil from the.factory and sold it to an old woman....shed fry the motor assuming she could drive like she's evading police!
Also forgot to mention that not all motors are built the same. Race motors are usually sleeved and either aluminum blocks with iron sleeves or have irol cast blocks. You gotta remember that not everything on your motor will expand and contract as hot and cold permit. They're not memory metals...if they get too hot and shape wrong well game over.
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