I just visited the Castrol website and "Asked the Expert" to clarify the difference between their 5w-20 GTX and Syntec Blend motor oils. I'd like to know from the horses mouth as to whether or not the GTX (or any "dino" 20 weight, for that matter) must use synthetic/Group III. I'll post Castrol's reply when I get it.
Also, Castrol Syntec is now available in 5w-20 grade!
. Just when I'd started weening myself off of Mobil 1 0w-20 to safe some money, Castrol goes and makes my choices more difficult! I can't wait to hear how this oil performs.
Z-
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