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Reply to "Hydraulic Oil vs. Motor Oil"

Not sure if your familiar with Texas Refinery Corp. or not but we offer a oil specifically designed for that type of equipment. It's called Pro-Tac IV and is actually a Caterpillar TO-4 and Allison C-4 equipment spec transmission fluid as would be found in dozers and other heavy equipment. It's available in SAE 10, SAE 30 and SAE 50 viscosity's.

If it's only needed for a hydraulic system I would suggest a ISO 32 hydraulic oil. Here's a list of approximate ISO to SAE viscosity's:

ISO 22 = SAE 5
ISO 32 = SAE 10
ISO 46 = SAE 15
ISO 68 = SAE 20
ISO 100 = SAE 30
ISO 150 = SAE 40
ISO 220 = SAE 50
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