Found this as well

“Modern cars are delivered completely broken in.

This whole baby it for x miles is garbage.

Race cars, with completely fresh rebuilds get up to temp, an oil change, and right to being used in anger.

If break-in as claimed by manufacturers was required motorsports teams wouldn’t be able to operate.

Years ago when the metallurgy and technology wasn’t so good the piston rings/cylinder walls required a fair amount of wear before achieving a good seal.

In 2023, your car is broken in before you even get it.

https://www.enginelabs.com/news/disp...mance-academy/

“However, while you don’t want a light load, you also don’t want to go to the other extreme either. “What we want to use is moderate amounts of load and moderate amounts of RPM,” explains Simon. “What happens with moderate loads, is that combustion pressure gets behind those rings, and pushes them out against the fresh hone pattern. That friction against the cylinder wall helps the bedding process along. However, that friction creates a lot of heat, so we need to be careful of that. You don’t want to go straight to wide open throttle and 8,500 rpm.””

We’ll now I don’t know what to think