I mean, there is if you want others to ascribe any merit to the claim you've made. If you don't, that's fine, but then I'd expect regular pushback on this subject in the future as a result of that decision.
Again, that's not my responsibility, I'm not the one who has made the claim here with respect to the merit of flushes, you are.
Quite likely. I simply fail the see the utility of them, I see them as a money grab and you've presented nothing that has made any inroads into swaying my position on that.
It's not a cherry pick, the
testing in that college paper was designed around turbines and compressors, per the sections I quoted. The overarching
observation that varnish formation extends beyond that scope; beyond the scope of the test mechanism, doesn't change the nature of the test.
Of course since this was a bench test designed to gauge efficacy of varnish removal, not evaluate systems-level impact, little consideration was given to the results of the chemical removal mechanism beyond the passing mention of large chunks being liberated by one of the cleaners that blocked the filter.
Since, as noted, there is no regulation with respect to these flushes, their impact, safety, and effectiveness isn't formally qualified by any overseeing body. This makes them risky, which is why OEM's make the statements in their manuals telling people not to use them, like I provided an example of.
I have no problem with people spending their own money on things of questionable value like flushes, that's their business. I do however take issue with people trying to spend other people's money on these products. If you recommend something and claim feats of excellence, I think it's quite reasonable to be expected to back those claims up.
If you haven't read the HPL engine cleaner thread, I'd highly recommend it:
Since the topic has come up a few times I am posting the PDS in the PCMO, Diesel, and Euro sections. This is a safe path to clean varnish and or sludge left behind by other oils. There are no solvents in this oil. It has enough ester to clean but still be safe with elastomers. Simply add a quart...
bobistheoilguy.com
Also, if you search for "flush" and user
@MolaKule (an experienced formulator) you will find this post, amongst others:
Which mirrors my position on the matter.