What weight hydraulic fluid do you use for your HST?

[RalphVa]

JD carries 2 different viscosities. I use the lightest.

The oil will not evaporate and will work as long as it's there; so light weight in summer or extreme heat is no problem. Need low vis to keep from building too much pressure in the winter.

Ralph

 

[LouNY]

This is what I use, it flows good in sub zero temps and works good in the heat of summer.
http://www.tractorlife.com/wp-content/uploads/2014/02/Cen_Pe_Co.pdf

 

[TractorNH]

My Mahindra dealer recommended and sells (right next to the Mahindra brand oil) Coastal Multitrac Tractor Hydraulic Fluid made by Warren Oil, the same company that makes many oils for other manufacturers including Mahindra. It is also sold at AutoZone and is just under $50 for a 5 gallon pail.

http://www.warrenoil.com/MSDS-Spec/PDS/Coastal/PDS - Coastal Multitrac Tractor Fluid.pdf