Quote Originally Posted by ajhaig View Post
We never had to add oil between oil changes in our 1991 Marathon - 8V92 (probably because we changed the oil more then we needed to), but I would always have the oil reservoir tank drained and re-filled with fresh oil when we had the oil changed.
Ditto on mine for the short time I have owned....did learn that the tank only holds about 9 qts rather than the 10 qts the manual states