But we still have the mystery of dual rated PHOS limits from my quoted article. I just reviewed my old files and then perused new API CK-4 oils on the Shell site.You are quite welcome!
Where there were in the past many Dual Rated or Multi Fleet API CI-4/SM Rotella T4, T5, T6. I see now few current 10W30 or 5W40 showing an API SM or SP approval - Just JASO on the T6. I would guess the industry is understandably trying even harder to keep high SAPS 30 grade lubricants out of emission-controlled, converter equipped cars and light trucks - where sneeky BITOGer's look for a work around
UPDATE: I just found this dual rated outlier. I have never heard of this product but I am not the target consumer.
Also found the old 0W40 low saps "arctic blend" 0W40 is dual rated API SN
Now I just found this 5W30 (!) Dual rated that busted my theory above, oh the agony!
Is it low phos < 0.08 % ? A very interesting oil - check it out. There are colour dirty TC housing and piston pics too!