Quote Originally Posted by slidetaker View Post
Castrol, Shell, Valvoline, Pennzoil all printed "Fully" while and only Motul, Mobil printed "100%". Are these "Fully" more likely to contain hydrocracked minerals rather than the "100%" that likely to contain more PAO stockbases????

Perhaps the pricing on these engine oils give a hint too. These "Fully Synthetic" 5W40 are all $58 pretty exact. While the Motul and Moil are $68 pretty exact too, which is 10 bucks more for these two "100% Synthetic"...
Look at it on a case-by-case basis. Example, Castrol Edge 5w-30 is hydrocracked, but the Edge 0w-40 is PAO. Both say fully synthetic.