It doesn't ring a bell. The time period does sound right though. They were coming over in the late 1870s and early to mid 1880s, I think.
I've done a search or two on the Internet and found some Oehlman[n]s in New York, though I've not contacted them. It was only a news story I happened to see.
My Oehlmanns originally spelled the name with two 'n's, but I think they may have dropped an 'n' at some point.I think my Oehlmanns came through Ellis Island, went to Milwaukee where some of them may have stayed, and then went to Cedar Rapids. There are apparently some Oehlman[n]s left in those parts.
To tell the truth, I've not gotten very far on this side of the family because I've been researching some other lines.I know pretty well who my Oehlmanns were in America, but I don't know the lines they left behind in Cedar Rapids when my g-grandmother moved to Texas. At this point, for me to actually go beyond what I know would require research in Germany which may come some day.
Until then, it would be nice to know how I'm related to other Oehlmanns in America. You might wish to see my website at: www.genealogy.com/users/b/r/o/Khatrain-Brogdon/
Just scroll down until you come to the various family lines. The Oehlmanns were related to Poethig, Sommer, Spangler, Niedling, and Graefe families. That's the best clue I can give you for now.