I am not worried about or even mentioned seals.
I would be concerned about running hot oil with something that thins it out even more. They is why many of the flushing products were 'cold engine' 5-15 minute flushes. Now, they don't mention 'cold engine'. Guess they had to cater to the quicklubes that only work on hot/warm engines from being driven there.
Unless there is some issue, I wouldn't bother. Easier to adapt a more sensible oil change and not worry about distillate flushes. Would be interesting to see if MPG, idle smoothness, pep, whatever... improves or not. A well cared car shouldn't notice much difference.
BG 109 is even thinner than the Valvoline stuff. Amsoil too is pretty thin.
I haven't seen any work better than any other. Local autopart stores carry these, and walmart usually has one for $5-7.
MotorMedic
motormedic.com
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STP® Synthetic Engine Flush deep cleans the engine for a better oil change
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