hmm, well it may be "normal" for your engine, meaning if not driven a lot , I suspect it may not "burn off" some of the normal blow by which then just accumulates.  Is it wet or dry? Just notice it or has been it been there awhile. What about plugs , are they burning clean ?
Unburned hydrocarbons can be black , but dusty like and not oil like...
Just throwing out ideas 
__________________
Ron
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