I would also look for any signs of a small oil leak (nothing major; just a trace or smudge of oil) from the crankcase breather covers mounted to the top of the valve covers. These are sealed only with an RTV-like material at the factory and are prone to "leaking" after several years of use. Not a major repair, but something you may have to deal with "down the road". Nearly all of us had to fix this issue on our Crossfires. Lots of discussion in the Forum on this repair with good write-ups & pictures.

The valve covers themselves will also develop leaks, but this is not as prevalent on all Crossfires. Not sure why some of us find this leak and others don't. Probably has to do with engine load & prolonged exposure at load that generates this leak. "Little Old Lady from South Beach" probably didn't drive the Crossfire like some of us do!