Having recently serviced my X-ONE, I have several recommendations.
About 3 1/2 quarts of hydraulic will drain from the reservoir when replacing the hydraulic oil filter. With the rear discharge deck in the lowest position, I was able to get a regular plastic oil drain pan under the reservoir and get it out without spilling any oil. The next time that I do this service I will warm up the machine and using an oil withdrawal system, remove the oil from the reservoir before removing the filter.
Also not good to run a fuel tank out of fuel as getting fuel to flow after refilling the tank can take time. Watch the fuel gauges and don't let it happen. The fuel evaporative system, part of which is installed in the fuel tanks, is the reason for the slow return of fuel flow following running out of fuel. This is not a negative comment, just a caution to operators.
Fuel tank caps can easily get cross threaded when putting them back on, just be careful when reinstalling them.