Hi, looking at changing the filter and oil in the fan/power steering hydraulic reservoir on 2005 Beaver. Filter doesn't look like it's been changed in like forever. Will the reservoir drain completely if I just pull the filter? Or do I need to pull either the plug or hose on the reservoir? I would be tempted to just pull the plug on the bottom of the reservoir but see some reference to that being an unused internal filter? Are their filters internal the tank I need to change? And finally, spec calls for Dexron III but does anyone recommend Transyd?