Good to know.
So we can put the Rislone in NOT SNAKE OIL category. - At least as far as composition is concerned
But ZDP does have detergent action so that statement is not totally correct.
And the treat rate can be adjusted to get the desired % Phosphorous, typically ~ 0.12
For a while most ZDP boosting additive were disappearing from the market likely under pressure from Automakers, SAE, ILSAC and API. Three- way catalyst and thin film wideband lambda can be sensitive to earth metal deposits
I wonder if some general advisory have lapsed or they just don't have any teeth.