Midlands Oil Hydraulic SAE 10 is expressly designed for hydraulic systems on off-road machinery such as the yellow machines made by Caterpillar™ and many others. It is customary in this industry to use 10 weight engine oils for hydraulic fluids. That is okay, but engine oils bring to the table several things that are not required for hydraulic systems. These things may not even be very good for hydraulic systems. For extra heavy duty performance, specifications require a minimum of 900 ppm of zinc from the anti-wear additive. This is far beyond the zinc levels for industrial anti-wear hydraulic oils.
*All images shown are for illustration purpose only. Actual product may vary due to product enhancement.