Yamaha Rotor Oil – Synthetic June 13, 2012 by The String & Horn Shop » Products » Band » Brass Accessories » Yamaha Rotor Oil - Synthetic Yamaha Synthetic Rotor Oil provides excellent, long-lasting lubrication on all brass instruments with rotary valves. Great for your french horn, or any brass instrument with rotor valves. total_sales: 0 Quantity Price: $9.95 Updating cart...