many engines do not require this procedure. It depends on whether the engine is equipped with hydro-compensators: these are devices designed for automatic adjustment of the thermal gap. They work at the expense of the oil entering them from the engine (that is why, actually, and are called “hydro-compensators”) and completely exclude the necessity of periodic manual adjustment of valves.
https://www.bradkimberley.com/valve-adjustment-what-is-it-why-is-it-needed-and-what-happens-if-you-dont-do-it/
I’ve never met an engine that doesn’t need valve adjustments, even with hydraulic lifters.
Now the adjustment period is far longer today, like in the 100k miles range.
Just be glad you rarely see shim/bucket adjustment these days. Boy was that a bitch.
I never met an engine.
The engines I’ve seen with hydraulic lifters do not have anything to adjust.
Unless you’re talking about cleaning out the oil ports when they start to stick, but I wouldn’t call that an adjustment.
Could you give an example? I’m curious
(Not a professional, just interested in cars)