From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Viscosity data for different Mobiloil Aero grades at various temperatures.
| Identifier | ExFiles\Box 145\1\ scan0057 | |
| Date | 1st December 1933 guessed | |
| Y56-12948 No. V.O.Co., Ltd., to 32 °F 100 °F 200 °F Centipoises Centipoises Centipoises Mobiloil Aero "W" 42.4 2.08 .190 Mobiloil Aero "H" 72.2 3.34 .266 Mobiloil Aero "XH" 108.2 4.05 .308 .190 centipoises - Mobiloil Aero "W" - 200 °F -do- - Mobiloil Aero "H" - 220 °F -do- - Mobiloil Aero "XH"- 228 °F 42.4 centipoises - Mobiloil Aero "W" - 32 °F -do- - Mobiloil Aero "H" - 44 °F -do- - Mobiloil Aero "XH"- 48 °F | ||