The sour cream constitutes a significant portion of the ingredients. The results from replacing that volume of sour cream with some oil will not yield the same baked product...
I would recommend substituting non-dairy (vegan) sour cream for the dairy sour cream):
http://en.wikibooks.org/wiki/Cookbook:Vegan_Substitutions
http://vegetarian.about.com/od/guideproductpicks/qt/vegansourcream1.htm
Also, are you making the WASC recipe that uses 2 Tblsp. oil per cake mix?
HTH
I bake dairy free when possible - using substitutes. I've had great success with toffuti sour cream (non-dairy). I use it instead of sour cream in all my recipes.
wonderful! Did you read the box for milk ingredients first? Taste wise and you aren't going to believe me until you try it, but next time try subbing out a few TBSP for regular old mayo. Works like a charm. Love the tofutti stuff!!!! We always have some on hand.
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