No need to apologize. Called an old friend that knows a tech for a kia dealer. He asked him the same question I asked. The tech responded with "I know exactly what he's asking. There is nothing in Kia's manuals as to what lubricant to use before installation. I just apply some gear oil." I called a local dealer I buy parts from and the answer I got from the service dept. left me with a hung low and shaking head "Don't know, we replace the whole unit." What!!???? Have not contacted Kia directly yet but appears no one at the local level where I am knows. Before I reinstalled the axle shaft I lightly packed the bearing with bearing grease and coated it with 90wt. gear oil right before sliding it back into the housing. Eventually I guess I'll find an answer--I hope.