Why when i use folgers coffee does it leave a nasty film on top when i pour it in my cup?

If i use Doller General columbian coffee it don't leave the film. Have cleaned coffee maker and makes no differance with folgers.|||use the paper filters on it and it will take most of the oil off the top. Its oil that is in coffee naturally but paper filters help.|||Do you have well water? That could do it.|||It's not really a "nasty" film.All coffee retain certain oils from the processing of the beans. Yes the oil is IN the bean.