Mini Z 19/52 Hydraulic Oil Question

[pilotguy]

I have a Mini Z 19 Kawa 52" mower. I noticed the hydraulic oil in my reservoir is lower than 1" from the top (more like 2"). I will like to fill it back up to within 1" according to the service manual. What kind of hydraulic oil should I be using to top it off? Just want to make sure I use the correct oil.

Thanks in advance.

[mowerconsultant]

The oil should just be touching the bottom of the screen in the opening.
We use Mobil brand 10w40 motor oil for our hydraulic system.

Pj