Must have been running Quacker State or Pinheadsoil. I'd put a little atf (1/4pt.) in the oil and run it for about 50 miles, then change oil and filter (use cheap stuff), do the atf in it again, and change to good filter and oil. Watch to be sure the gup doesn't block the oil pump pickup screen - eagle eye on the oil pressure gauge, and don't trust and electrical (stock) gauge to respond fast enough to save the engine if it blocks up.

Not responsible for advice not taken...