Originally Posted by MoCoTom
The 80-90w is what I used when I replaced the rotors on my W-22, but that job requires hub removal so there was no mixing with old oil.
While I agree that removal of all the old oil is best, as long as the original oil is not contaminated, I have no issue is sucking out or draining the old oil, filling with new. Repeat the change process 2-3 times. Drive between changes if possible. Total is still less than a quart.
Contaminated with water, metal, etc, and no question, the whole assembly needs to come apart to be serviced properly. Different than just straight Preventive Maintenance.