Improper engine break in.

not exactly the same anymore YR
the base stocks like u find in redline and the new corvette 0W-40 don't shear down because the
basestocks are so good
vett oil is Dexos 2 as opposed to DEXOS 1 rev 2
Mobil 1 ESP made from natural gas- no wax
It just does not thin out with heating up
don't need no stinking viscosity improvers- which is what shears down loosing VI
that's how they get a 20,000 mile oil (not with carbs)
where's 540rat when we need him :)