Wrapperman gave us the tip about this location. Never would have seen it. It does have a small plastic cap hiding it. And mine looked like it had never been greased. There was no sign of even a tiny bit of grease anywhere at this location! Makes me suspicion that not all service employees know its there. My coach had been to a Ford truck dealer for service 2 or 3 times.
You can access this zert pretty easily thru the engine compartment. I would suggest everyone check theirs to make sure it has been lubed. Its easy to get at with a grease gun from the engine compartment.
Lastly, Iggy showed a good idea for a pour spout that fits a quart or 5 quart oil jug. Well WallMart has a great spout for about $3 that even has a shut off valve and a foot of clear tubing. Works great!