What Hydraulic Oil?

[Bob_z_l]

I have a petrol powered 12T splitter. 

I really ought to change the oil but the brief instructions don't offer any spec. 
My local Ag dealer has only one type at the moment HLP46  Will this do? Or is there another spec / grade I should look for?

 

Cheers in advance. 

[scbk]

If the machine is running fine I don't think I would change hydraulic oil.

 

If there's a filter, then yep change that.

[GarethM]

You don't need to change either as it's an entirely closed system.

 

If it looks milky, yeah change both it as it's gotten too hot or is contaminated with water  or of you've had to replace any part of the hydraulics.

[Bob_z_l]

Thanks both @scbk  and @GarethM  
I hadn't considered the leave be approach. I routinely change engine oil and thought there might be a sell-by on the hydraulic.

 

 

Many thanks. 

[GarethM]

I'd only every change hydraulic if it gets contaminated or on say a tractor that has trailers and such being used and taken off.

 

As dirt gets into the system with tractors etc, my splitters are still on the same oil after about 5+ years and probably 3000hours.

 

The key is always keep it cool and keep it clean.