I just replaced the coupling on kenmore 80 series,wouldn't spin or agitate,every thing works great now,but I have oil leaking out from under my machine,what could be my problem?

There is a seal under the coupler, possibly damaged during replacement. If so, you can remove the coupling, pry out the old seal and install a new one. Not an uncommon issue with a direct drive washer. If the oil is leaking from the top, that's a different story and not typically a DIY job.