The VI on the 5W-30 Extended Performance is 166 vs 159 for the regular Edge. Both have Titanium in them, just wondering if they are the exact same oil (base wise) with the Extended Performance have more VI improver & detergents for longer DI's. I'm specifically wondering if Castrol went the way of High Calcium for the Extended Performance vs being a usually high Magnesium oil. I'm tempted to just buy a quart of each & send both off for comparison VOA's.....I actually called Castrol with this question & was told quote "the exact formulation is propritory, & isn't public information"....I explained how I could easily send off a sample for analyst, but really wanted to save the money by doing that....again it was like talking to a tape recorder with the same line, again & again. The VOA's I've seen on here are mostly the older Castrol edge with Syntec (without titanium) & the other one I've seen didn't even list titanium from Blackstone (their error I guess).
