i bought an oiler from Clotilde's that has a long tube the oil is in and a long (like 4") thin needle type end that the oil comes out of - it has a small rubber stopper- i've been using it for 3 years now- have never had any sign of any leakage---and it makes it possible to reach hard to reach places- one of the best (tools) i've ever bought.
i think it was about $9 with machine oil included