Thats alot of bunk. Syns dont cause wear and if fact reduce friction thus reducing wear as compared to petro oils. I would not buy a cam from them if I could not use syn.
Maybe they have some tech from 30 years ago that remembered a glycol base syn that was not a good product, but those are long gone. The top racers in the country, NASCAR, Drags, road racers, have all used syns like Amsoil and Mobile 1.
Logic dictates, reduced heat, cooler running equals less friction, less wear. Plain and simple. The writer of that article doesnt know what he is talking about.
Of course this is just my opinion but Ive used Amsoil for over 25 years. Never had an engine wear out, and now my Camaro is sipping Amsoil too. Best transfusion its ever had.
69RS 350/255 LM1,TH350,Dover White,Blue Vinyl top
F&R spoilers,pdb,Close ratio ps,am/fm,3.08 Posi.,A/C,
fold down rear seat.
My RS www.brainerd.net/~knudsen/69RS