After shipping it is cheaper to buy a 13 oz tube from another primary vendor versus purchasing this item alone. I considered this to save money, but it doesn't come with the syringe and what are you going to do with the remaining 12.5 oz. I've been using this syringe of grease to build a V0. I haven't even used half of it after greasing all of the rails and using some on the extruder gears. Put it in a cart with other items to spread the shipping cost out. You'll be satisfied with the purchase.
I found two methods online to grease rails. One is using the tip in a hole in the carriage. However, I found the hole in the V0 carriages to be too small for the tip. The second method, which I used, was filling the carriages from the bottom of the rail, through a mounting hole. The threaded tip of the syringe doesn't quite fit M2 sized mounting holes but I was able to seal it enough to get plenty of grease in the bearings. It seems impossible to do without getting grease everywhere so I just did my best. I hope this helps others.