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).
Table comparing the viscosity of various oils in Centipoises at different temperatures.
| Identifier | ExFiles\Box 145\1\ scan0060 | |
| Date | 30th November 1933 | |
| Y56-12948 VISCOS No. V.O.Co., Ltd., to 23 °F Centipoises 100 °F Centipoises 200 °F Centipoises Mobiloil "D" . . . . . . . 90.8 2.42 .212 Mobiloil "AF" . . . . . . . 65.7 1.55 .138 Mobiloil "A" . . . . . . . 40.2 1.17 .117 Mobiloil Arctic . . . . . . 15.7 0.73 .092 Castrol "XL" . . . . . . . 62.4 1.67 .154 Castrol "XXL" . . . . . . 128 3.01 .252 Motorine "C" . . . . . . . 57.4 1.53 .145 Aeroshell . . . . . . . . 130 2.57 .204 Essolube 40 . . . . . . . . 52.2 1.40 .134 Essolube 50 . . . . . . . . 74.8 1.82 .161 30-11-33 | ||