I have a nice 3 1/2 ton floor jack, that I bought from Sams about 10 years ago. It has always been a very reliable, and safe jack. About 1 year ago I noticed, that it was not jack up all the way. It would go 3/4 of the way up, then it went to only half way. Now its only going 1/4 of the way up. I checked the oil level and as soon as I unscrewed it a few rounds, the fluid started coming out. I let my grandpa use it about the time the problems started. He said he put some jack oil in it. Now I am thinking that it is to full, but my question is it says 3/16 to 1/4 of the way full. how do you know how full it is? Now, it wont even jack up at all... I don't want to trash it, because its been such a good one to me. Is there anyway of trouble shooting it? I googled it, but I really did not find anything useful.