I use a plastic blunt needle syringe for accurate oil lubing. A metal version would likely hold up better when being kept in a toolkit. Blunt needles are inexpensive and readily available on ebay and from Amazon, including caps. Would suggest keeping a cap on the needle to help protect it and help prevent accidental oil seepage while stored in the toolkit. There are several chassis points where oil lubrication is desirable, such as foot-peg pivots, certain carb areas, cables, etc.. I would look favorably on noticing a metal syringe in a bike toolkit for oiling. Same as for a pencil tire pressure gauge.
I moved this topic to the Tools forum from the About The Site forum.
I use a plastic syringe for topping up my battery. Saves spilling the distilled water all over the place and you can creep up on the top level line. Ive also used one for sucking brake fluid through the lines to get a head start on bleeding them. Im sure Ive done other stuff with them. They are one of those tools that are so handy to have and cost nothing (the plastic ones). I have raised eyebrows when asking for them in my local chemist but after explaining the reason, I got a handful for free.
Also handy for changing the fluid in the indicators (blinkers)!