is a low-friction "anti-stiction" fluid designed to eliminate "stick-slip" noises in hydraulic cylinders. It has been largely superseded by part number , which contains the same formulation. Where to Buy 1U-9891

1 Hydraulic Oil Additive Caterpillar Replacement 1U9891 - eBay

You can find this additive through specialized heavy equipment parts dealers and major online marketplaces:

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