VISUAL DESCRIPTION
This is a vintage advertisement for Mobiloil Aero "W" and Mobiloil Aero "H" motor oils, specifically endorsed by the manufacturers of the D. H. "GIPSY" engines after exhaustive tests. The ad suggests that Mobiloil Aero "W" is suitable for touring conditions, while Mobiloil Aero "H" should be used under racing conditions. At the bottom half of the image, there's an illustration showcasing a detailed cutaway view of an aircraft engine with multiple cylinders, likely to represent the type of aviation engine that would benefit from using these specialized oils. The text at the bottom indicates that Mobil oil products are also recommended by other prominent airplane and engine manufacturers from various countries including Germany (Heinkel), France (Caudron), Japan (Nakajima), Italy (Caproni), Sweden (Svenska Aeroplan AB - SAAB), England (Fairey, Hawker, Avro, Bristol) as well as American companies such as Pratt & Whitney and Wright. The advertisement comes from Vacuum Oil Company Limited based in London S. W. I. , indicating its historical British context.

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