Hydro oil

I recently purchased a Hustler Fastrak Super Duty... and I noticed the dealer just has enough hydro oil in it to barely cover the bottom of the tank is this normal...I'd appreciate ANY feedback thanks

After I bought my exmark, 20 hours of mowing later I noticed that I couldn't see any hydro oil in the small tank. Granted, you don't need much in it coz most of the tank is the expansion tank. But I later realized that they must not have put enough in it on the factory assembly line because it was almost bone dry! I went to my dealer and bought some hydro oil and filled it up to just below the full line. It lasts for ages, but make sure there is some in the bottom of the hydro tank.