I'm ok with the piston but I edited the post to use the ones from LSJR video instead. I'm not quite sure why they labeled them that way, but I have no reason to believe they're lying.We should probably avoid sharing the slide that has totally different pistons I'm thinking? Just in terms of a credibility perspective. Stick to ones that show the same slugs, otherwise it comes off as disingenuous.
Also, PBR was designed to do its job in one go, as what @Shel_B posted from Valvoline shows, so yes, perhaps it needs to have 50% Group V to clean the ring lands in one shot, but we cannot, with any degree of reasonability, extrapolate that to mean you need 50% Group V to clean the ring lands. The obvious inference would be that if you use less of that ester (or AN), it's going to take longer, see: HPL engine cleaner, which is NOT designed to do the job in "one go", but gently, to avoid the issue Valvoline mentions: plugging the oil filter.
That is true, over time oils with high solvency could very well clean pistons rings over time. That's just my guess though. I also think if you just using a top tier oil from the start R&P is of no use.
They do have these shots and shots from LSJ video:
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