That may be so, but, one could also have a relatively high calcium content, sky high starting TBN oil, with VERY LOW NOACK (like the latest formula Amsoil Sig Series), and still have anti-LSPI properties.
It seems like the only truly 'deadly' combo (as far as LSPI is concerned) is a HIGH NOACK number combined with a sky high calcium, sodium/other sulfated ash additive.
Unless
ALL of the 'culprit oil' is entering the combustion chamber via the valve seals, and/or the ring packs, it is getting there by means of volatilization from the PCV system, and bringing whatever sulfated ash compounds are in that particular oil along with it when it does.
I want
BOTH a low SA/sodium/calcium detergent/dispersant/TAN reduction add pack, AND VERY low NOACK PAO/POE base stock, along with a STRONG trinuclear moly/boron/magnesium, and either titanium or tungsten anti-friction/anti-wear add pack.

(Blauparts had better get that Ravenol DXG in stock 'right quick'.
![Mad [mad] [mad]](/images/smilies/mad.png)
)