In regards to Oreos –
A friend of mine called the OU and I called someone in the CRC (Chicago) and they both said that Oreos Should be treated as Parve but Dairy Equipment. The OU for years now doesn’t use the DE label and marks anything DE as D for a number of practical reasons. Oreoes have no dairy whatsoever but some plants use Dairy Equiptment.
I also called Nabisco and asked them about Oreos in regards to a dairy allergy and the lady told me that they are absolutely fine. She said that I should check by the ingredients where it has allergy information, it would say dairy under allergy information if there was any allergy concerns. She said however, I should check every bag I buy, because if a certain plant needs to use dairy – they would put it on the label. I asked about airborne particles and she said there is nothing to worry about. She said that ANY Nabisco product that has any amounts of dairy will always say dairy by allergy information. So the I said but why does it have a D by the Kosher symbol? So she said that it’s because some places use equipment that also processes dairy and some religious groups don’t eat food if it was processed on the same equipment as dairy stuff.
Additionally I know two people who have extremely severe dairy allergies and break out by even the slightest amounts of dairy – well beyond botul b’shishim, and they both eat Oreos with no problems.