Paxman rotor oil is a specialty light-grade oil formulated to keep French horn rotary valves working as quickly and freely as possible.
Modern French horn rotary valves require three different grades of oil. From thickest to thinnest they are: bearing oil, linkage oil and rotor oil. Apply the first two each week, if you play regularly. When a valve become sluggish, drip a tiny quantity of rotor oil directly into the rotor casing, having first removed the valve slide to allow access.
For reference, a maintenance schedule recommended by the Rosehill workshop is included alongside the product image(s).
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