I changed the lower unit oil on the 01 250 fichts saturday.The sb oil came out a med/dark green with no smell.The port oil came out a dark green/brown color that smells burnt.There were almost identical amounts of oil in both units.I replaced it with the evinrude synthetic lu oil that I was planning on running next week in florida and then changing it out again to flush the lu when we get back..The boat has been used twice over the last 6 months.What might cause this and do I need to have someone look at it?Thanks