I bought a 1999 Case 1845C late last year. Finally got around to checking the chain case oil. The chain case oil on the left (when facing the front of the machine) was to the top of the chain and was milky white and thick. The case on the right was okay. I am in the process of draining the oil and trying to clean out the remains of the white oil. The manual says to add five quarts of 10W30 to each side. Is this really enough? Anyone have any good ideas on how to clean out the old oil? Any help would be appreciated.