It's a recent change.....they "jumped ship" from the "Synthetic Blend" craze.......now it appears only MotorCraft is "still there"
castrol is funny, on their Syntec/Edge they use the term "PART SYNTHETIC" LOL....
I could have sworn I read somewhere about the whole "Synthetic Blend" thing going to "court" for discrepency though? What constitutes a "blend" - exactly? 99% Conventional, and 1% Synthetic? Further more, you have various "grades" or "qualities" of "synthetics" lol?