Why is my cat over heating and why does it have oil on the filter ?

No the converter is not glowing red.would that be all ? It heats up some say it can be caused by the fan. My fan only turns om when I turn the AC on

that"s the condenser fan that comes on when the A/C is turned on.the other fan is the radiator fan and comes on when it gets to a certain temperature,then cuts off when cooled down.unless you are 100% sure that the radiator does not come on while driving it,then the coolant temperature sensor/sender is probably bad...FAN has nothing to do with the converter! you stated CAT in your question,but did you really mean CAR?

I meant car sorry and thank you

you 're welcome.