I purchased a 34 ton Swisher log splitter this fall, and it performs great, however since the weather has turned colder I have a problem with, what I would call friction static at the oil return line on the oil tank. This unit does have a plastic tank, and it actually shoots an arc about 1 inch long inside the plastic return fitting which is molded into the tank. After running the splitter about an half hour and the oil is hot this arcing subsides. But until then it will occasionally give you a zap when touching the control lever on the valve. I tried a ground wire to a rod in the ground and this did not help. I called the manufacturer and they said they never heard of such a thing until I sent them a video clip of what was happening. They have referred me to a service center who is also scratching their head. I think the problem is the plastic tank, since oil makes a poor conductor, it is building a charge from the oil passing thru the rubber line into the plastic tank. It has 10 w oil in it. Anybody ever have this happen??