I purchased a few qts of the Edge with Ti, gold bottle 5w-20, clearenced for $3.00/qt recently at AZ. On the Castrol website I found this, http://www.castrol.com/castrol/sectiongenericarticle.do?categoryId=9045409&contentId=7081015. Anyone with info on how, or if, the formula has changed between the two? Did they just rename it?