Ive been using the castrol gtx hm in the wifes 13 equinox with the oil burning issues. The gtx has less phosphorus and replaced by other additives (to protect or prolong the catalytic converter)... yall know... . Learned a few months ago that they have the Edge hm with the same additive replacement. The Edge is full syn with the titanium additive "technology" ha. The gtx is a syn blend. Neither are dexos approved. Question is, would it be best to burn one or the other, Full syn or syn blend? Just curious if one or the other would be more beneficial. Thanks.