How do I stop the oily residue in my brewd cup of coffee? The coffee maker is new. The residue is not from our filtered water.

Thoroughly wash the pot and the basket with a good oil/grease remover (detergent) such as DAWN dishwashing liquid.

Then run White Vineger/Water (50/50) mix through the coffee maker TWICE, with the basket and pot in place. (NO coffee, nothing in the basket)

DO NOT RUN any detergent or soap through the coffeemaker at any time.

Then, run straight water through the coffee maker TWICE (no coffee, basket empty)

Then wash the pot and basket out AGAIN with a good detergent.

This will remove any residue that is in the coffeeemaker from the factory.

As coffee brews, there IS a slight amount of oil that is produced. The coffee itself has oils in it, and is part of its flavor, and freshly brewed coffee will have a slight oil residue.