OEM product. I wouldn't recommend using anything else for power steering pumps. My car model is not designed for synthetic power steering, so do not use fluids other than those recommended by the manufacturer. While synthetic materials claim to be good for rubber seals, they can't claim the same for the internal working parts of the pump itself. That's because they know it won't really help the pump itself. It spoils the details. The GM pump was designed and tested for refined mineral oil.
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