Quote Originally Posted by KWAWD

Is there a procedure to completely replace the old engine oil? Or is a drain and fill sufficient to get all the old oil out?
if you change oil regualrly, there is little reason
To flush. In fact on an old engine it is recommended to not flush it as you can loosen deposits in the oil galleries and cause damage. If you do want to do a flush, run a cheapish oil through the motor for a few hundred Ks then drop it and refill with good stuff. New filters as well obviously