I cannot say Valvoline manipulated anything. I just said that the comparison is not fair. Also I don't believe marketing because I work in marketing for a long time.You think Valvoline is manipulating them? You doubt their accuracy? Or what?
I don't think you're ever going to get someone to tear down their engine and not clean out the piston ring grooves while they're there.
If I'm a mechanic with a shop and have some side high mileage car I would do before and after Valvoline Restore and Protect and HPL pictures of the pistons.