I have a habit of using a plant sprayer, like the sort you pressurise when filling my autobox, all you have to do then is put the oil stuff in the big bottle, pump the handle up good and hard, then get under the vehicle, with the pipe with the sprayer bit on the end taken off, shove it in the hole and trigger the trigger.
That's assuming there is enough room else, you have to have a bit of flexi on the end.
Once used, you won't want to use anything else!