Well that was my first thought as well. (change immediately) But oil sits on the shelf for years and doesn't go bad. The only problem I see is condensation. But it should have evaporated already. (these motors get real hot don't they) I'm leaning towards draining the old stuff but I need to order, and wait for delivery, of the proper fleece filter. I don't know if its necessary. The dealer sure as shooten didn't give a crap. What other service does the wrench imply?