Gotta pour 6 ounces of 5W40 Synthetic Mobil 1 oil into a 1/2" hole in a compressor, not too quickly either or it will overflow, from at least a foot away, maybe a bit less. Removal of the compressor's wheel is how you are supposed to get at it, but even then you have to still get a tiny mouth funnel and not overfill and not fill rapidly too. Maybe a big 'ol, fat veterinary syringe or something with a tube attached to the tip?? 100ml oral syringe! Where do I get one?