I just bought my 1st forklift, an old Clark. I needed one badly for moving outboards in my shop and the price was too good to pass up. Call it rationalizing if you will. Anyway, I have a few questions that I'm hoping someone can answer for me. 1st, I'd like to know what model and year it is. The serial # is E7517KP99. 2nd, I need to replace the hydraulic fluid. Do I have to buy it from Clark or can I use a generic hydraulic oil? Thanks in advance for any and all advice.