"""Mobil 1 fed engine run for alot of miles and when torn down look really nice inside."""
...and the reason tey are 'torn down' is because they are worn out-clean, but worn out
Wow, that's a load of [censored].
The reason mine have been torn-down were for performance upgrades.
I've been running M1 since the early 90's in everything from push mowers to a 1950's Ford 312 Interceptor making 425HP.
I've never had to rebuild any of these engines.
My two 302's were apart due to Heads/Cam/Intake swaps.
The one in the Town Car, which had had a small portion of its life on M1 was no where near as clean as the one in the Mustang, which I had been running M1 in religiously for ~80,000Km since I bought it.
You've seen the pictures of the Mustang engine on here.
That 302 was rated for 225HP (flywheel) in 1987. 20 years later, I tore into it, swapped the heads for a set of ported GT40 irons, a TrickFlow Stage 1 Camshaft, TrickFlow "R" intake, 75mm TB, new timing chain, a set of 1.7 Roller Rockers and a set of larger injectors with a "calibrated" MAF (couldn't afford a chip tune at that time for it, and was planning on getting a TWEECER) and took it to the dyno. Car made 270RWHP (~325HP flywheel) with ~300,000Km on the stock shortblock and that was with a god-awful A/F ratio.
That engine was torn down AGAIN last year, new Camshaft Innovations camshaft put in, I've now swapped it to carb, and that engine is in a new car (1982 Capri Black Magic) with IRS from a 2001 Cobra. The engine has now outlived three transmissions......
Cross-hatching is still readily visible in all the bores, no ring ridge, and she holds wicked oil pressure. And this is NOT a babied engine as the application would obviously dictate.
Just one example, but no speculation or guessing, those are real results using M1 in an engine that gets WORKED.