New oil bottles from Harley-Davidson do not have a spout, and I find it challenging to avoid spilling oil when pouring.

Since I did not have a funnel which would fit in the tight space, I quickly modeled this; I'm uploading it in case you need one as well. If there is interest, I can improve the model or share the Fusion file.

I printed this in polycarbonate (PC) to stand high temperature, since on Harley tourers you need to measure the oil level when the engine is hot. I would assume that ABS or ASA would also tolerate the temperature, but I would avoid PETG (PLA is definitely not suitable).

The model might fit other bikes; please disregard my remarks regarding temperature if you add oil when the engine is cold.