Called Castrol and after twenty minutes of picking their brains decided since I got a 6:1 ratio of magnatec over edge to just use magnatec full force. I thought mixing would give me the best of both but since they are different beasts I plan to run the magnatec until the dead of winter,run last 4 qts of edge and then just run magnatec. Oil choices are tough and confusing sometimes. Makes sense to not mix b/c edge and magnatec are trying to do the same job,just going seperate ways to complete task on hand. I think magnatec 0w20 will be fine and maybe overkill since many people just use dealer synblend Honda 0w20.