So, I just get done making two 12" and one 8" for a layered wedding cake and as I'm mixing for my next several layers I realize that I forgot oil in the first batch!!! They are done now and I would love to know what ramifications do I have now with these cakes? Will they taste the same, will the texture be different?
It's a wedding cake? And you're being paid for it?
Redo it.
Really, unless it's for family there's no excuse for serving cake that was made without fat from a recipe that included it.
how much oil are we talking about? 2 Tblsp? Or 1/3 cup? etc....
If it is only a couple of tablespoons...then I wouldn't worry about it. However, my white cake recipe calls for 1/3 cup per box, therefore, if that is the case, I would rebake. Cause the oil is added fat which will make a difference in the moistness factor. A couple of tablespoons (like in the pkg recipe will not make that big of difference)....
I have done that before and it really makes me mad at myself! 
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