Every time I read anything about a "break in" on cars it always felt like people were just repeating old wives tales because I could never get an answer on what the result would be if I ignored it.

Will the transmission last 5000 extra kms or the engine will make it from 500,000 to 501,000 km? No one seems to know.

Makes it feel like poeple telling me I have to discharge a battery all the way because it has "memory" long after most batteries were lithium ion with a charge controller.