I have a 1991 honda civic and it burns oil and black smoke comes from the exost pipe and I was wondering if there is any way to fix that problem or if it will cost too muc h too fix.

I have a 1991 honda civic and it burns oil and black smoke comes from the exost pipe and i was wondering if there is any way to fix that problem or if it will cost too muc h too fix.
Any one here that can answer my question