APRIL TO-4 is a premium quality transmission and hydraulic fluid made from pure virgin base oil and APRIL NANO 1™ lubricant technology for unsurpassed protection and performance. While all three SAE viscosity grades are recommended for transmissions and final drives requiring a Caterpillar TO-4 lubricant, the 10W grade is additionally recommended for use in hydraulic systems requiring a Caterpillar TO-2 lubricant.
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