I’m not really positive what the thread is exactly about...engine break in, or oil viscosity (probably both), but I always am fascinated with engine break in discussions. I have no idea why...especially where it’s very unusual that I’ll buy a car new.
But my last one (2018 Silverado) purchased new...what did I do? I immediately left the dealer, hopped on the highway and drove it easy. Then I went on a 500 mile trip two days later. Probably the two things - I’d later read - that you shouldn’t do...long trip at constant highway speeds. I’m sure there were plenty of stop lights along the way to those first 500-700 miles. And probably a few higher rpm’s that happened, that I was trying to avoid. And then of course I dumped the factory fill oil at 1,000 miles...was later told I shouldn’t have (because that’s when all the moly gets to imbed itself into the cam lobes, etc). None of it mattered. The thing consumed oil from day one and I traded it in at 50,000 miles because the truck was a piece of garbage (starter failure at 34,000 miles, misfires right out of bumper to bumper warranty, frame rust, paint chips, Chevy shake, tranny wouldn’t shift right going up hills, oil consumption, fuel dilution in the oil). Hey, maybe it was all because of that 500 mile trip during break in?