At the present time the following Oreo Sandwich Cookies do not contain dairy ingredients, though they are manufactured on dairy equipment…
Original Oreo Sandwich Cookies
Oreo Double Stuf Sandwich Cookies
Oreo Original Mega Stuf Sandwich Cookies
Mini Original Oreo Sandwich Cookies
Golden Oreo Sandwich Cookies
Triple Double Oreo Sandwich Cookies
Oreo Thins Sandwich Cookies
The equipment is not necessarily cleaned before the production of these cookies, and there may be a small amount of dairy residue present. Nonetheless, the dairy component would be minimal, and from a Halachic perspective, the dairy residue is nullified (Botel B’shishim) and of no consequence from a Kashrus perspective. The bottom line is that these cookies may be consumed after meat and poultry but not together with meat and poultry (simultaneously).
The O/U recommends that Kosher consumers check regularly with the O/U office to confirm the status of these items as sometimes the manufacturer may choose to reformulate a product and add dairy ingredients. Since these products already bear an O/UD symbol, formulation changes would not be reflected in this Kosher logo.