Will H-Zol assist my hydraulic fluids flow in cold weather?
by Robert Sanborn on Thu, Aug 10, 2006, who was a member of the STLE Society of Tribologists and Lubrication Engineers for 15 years.
**Yes, H-Zol will protect the pump from chattering and will allow for faster start up. When mixing at only 3% the viscosity (ability to flow) of the hydraulic fluid will not be changed that much, thus you may need to treat at 5% or one and one half ounces per quart of hydraulic fluid. **