Because on some vehicles like my 2014 Mustang GT with the 5.0 the oil fill hole is at an extreme angle and the fuse box is right next to it so a regular size funnel will not fit and a small funnel is not big enough to work. Before I got that funnel kit, I would have to put a small funnel in the hole and hold it in place with a larger funnel while pouring out of a gallon jug of oil while trying not to make a big mess. Not fun. The funnel kit makes it much easier and cleaner.I don’t really understand the reason for that funnel - what’s the point?
I understand and appreciate the big ones for coolant, with all the adaptors. So thst you can really overfill and burp the system…
Ive never had an issue with oil funnels just sitting plainly with gravity in the fill hole. What am I missing?