What type of fluid should I be using in my 632. I called my local dealer and they told me 46W hydraulic fluid.I was glancing on the instructions on the back door of the machine today and it says use 10w30 and the use of hydraulic fluid is not approved. So what the heck gives here. I am really confused now. I am hoping that the 46W is ok and I don't have to drain the system. Thanks Steve