No reason not to use any whole wheat you like!The vitamix could grind the oats, no problem. Not sure how it handles large amounts of dry ingredients. If you have a hand mixer, I would recommend trying that. Otherwise, whisk the flour, sugar, salt, and leaveners together very well by hand or through a strainer, then stir in the oats. It would be difficult to get the oil evenly distributed without some power tool assistance. Susan

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