I caught the smilie at the end of your Honda-bash. Otherwise, I may have been offended.
(not directed at you, 715racing).
I can't speak for the Japanese auto engines, but motorcycles, yes. Nearly 200bhp/liter on an everyday, no special maintenance, DD, warrantied engine. Can you imagine a Pentastar 3.6 with 720bhp, standard warranty and Schedula A maintenance?
As most of us know, today's car engines are understressed, designed to a market point and people wouldn't know what to do with themselves if cars came with a large herd of horses at the other end of the reins, not to mention that engine would prolly cost at least $50K.
So, we get what we get and we're told how to manage it. That, IMO, in no way subjugates me to follow their guidelines written for the masses.
"Oh, I've been driving with the red light on for a while now...What? I have to put oil in it?"
People are stupid. They need guidance...and the world of profit preys on their ignorance.
Individuals can be smart. They'll figure things out for themselves, like which oil to use and when.
So, there's nothing special about production automotive engines, they're not Formula 1 powerplants. Put any shelf oil in it that meets the MFGs specs, at the least, and keep it clean. That, and filter changes, is all that needs to be done for your engine to live long and prosper. Well, quality fuel is a plus as is minding your coolant.
If you want to use a specialized grade oil for cleaning, economy, etc., go for it. Just have it meet or exceed the MFGs specs to keep your warranty in good faith.
The bottom line is, simply, keep it clean! Dirty oil doesn't just wear on hard parts. It wears seals, clogs essential, seemingly unrelated passageways(PCVs), etc.
Once damage is done, it can be a slippery slope...
What does clean mean? It might be easier to answer, what does dirty mean?
Discolored from heat exposure is normal, black is not. Dump it and change the filter.
Mileage is a guideline.
5000 smooth-paved highway miles at cruising RPM vs
5000 dirt-tracked miles at slow speeds with high engine loading; take a stroll around Central Park vs
hump 6 miles of the Appalachian Trail.
Which of those will you want/need to clean up after?
my rant is done.