Going away on a long trip bout 1,500 miles taking my new Lincoln MKZ 3.0 twin turbo bought used with 6,600 miles. Oil was changed when purchased now at 10,550 miles and OLM says 50% oil looks dark and smells a bit like fuel or at leased more so then other cars I have had with a few thousand miles on the oil so do I just trust the OLM and run it down to 10% or so or change it before I add another 1,500+ highway miles? By the way the car seems to not use any makeup oil or at leased not yet.