They do, I believe the wording is “65% cleaner pistons than the nearest competitor” or something like that. I don’t think they make the same claim on PP jugs, so there’s no way to tell what the difference between the oils is.I used it when it first came out, but now I feel like it is pretty much the same as Platinum, which is great oil. Why bother with paying more for it?
Until Pennzoil claims a significant difference, like they used to (claimed its use resulted in significantly cleaner pistons than Platinum, for one) I will assume it is marginally, if at all, different. I will look again, but the last time I saw the PDS for 0w20, it was nearly the same as Platinum.
I´d love it if they´d soup it up and have some clear data that it out performs Platinum and even other premium oils.
Percentages without the actual result is kind of a cop out IMO, the competitor could still have had a result 4x better than what was required by the test, and with both oils passing, a percentage better than pass is still a pass.