Thanks for the critical eye, JAG.
They also state, and include a graph in the process, that base stocks have the largest impact on auto ignition as measured using their protocols. As a result, the lower the Grp, the lower the occurance of LSPI. GrpII showing less propensity than III or IV. Until GrpV shows to be the most promising.
Maybe Motul, and Red Line should 'build' an oil with a reduced calcium/sodium, but with even higher POE content than anything they produce currently, with large amounts of 'trimer' moly in them? [dunno]