The following kashrus information from the OU in response to a reader’s question on April 24, 2012.
At the present time, most varieties of Oreo Cookies contain dairy ingredients, with two notable exceptions. Original Oreo Sandwich Cookie and Oreo Double Stuf Sandwich Cookie do not contain dairy ingredients, though they are manufactured on dairy equipment. The equipment is not necessarily cleaned before the production of the Oreo Original and Double Stuf Sandwich Cookies, and there may be a small amount of dairy residue present in these cookies. Nonetheless, the dairy component would be minimal, and from a Halachic perspective, the dairy residue is nullified (botel bishishim) and of no consequence. The bottom line of all this is that the Oreo Original and Double Stuf Sandwich Cookies may be consumed after meat and poultry, but not simultaneously.
Please bear in mind that the manufacturer may choose in the future to reformulate these products and add dairy ingredients. Since these products already bear OUD symbols, formulation changes would not be reflected in the OUD logo. As such, we recommend that consumers check regularly with our office to confirm the status of these items.
If you have any questions about this UPDATE please call Rabbi Mostofsky @ 757-572-6344.