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Paxman bearing oil is a specially formulated medium-grade oil which when used regularly will keep French horn rotary valves in top working order.
Also available:
Paxman linkage oil 20 ml
Paxman rotor oil 50 ml
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).