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).
The viscosity values and dilution of eight different grades of Shell oil.
| Identifier | ExFiles\Box 145\3\ scan0258 | |
| Date | 16th July 1937 guessed | |
| OIL VISCOSITIES. The following are the viscosity values (Redwood No.1) of the eight grades tested. @ 70°F 140°F 200°F Density @ 60°F Old Single Shell 1140 secs. 150 secs. 61 secs. .888 New Single Shell 845 " 124 " 55 " .878 Old Double Shell 2400 " 205 " 68 " .928 New Double Shell 1340 " 171 " 64 " .881 Old Triple Shell 3400 " 265 " 80 " .926 New Triple Shell 2400 " 261 " 84 " .890 Old Aero Shell 3960 " 330 " 96 " .920 New Aero Shell 3390 " 350 " 106 " .895 The dilution and absolute viscosities of used samples from the sump (after 6.4 miles) were:- Cold Hot Dilution Old Single Shell 1700 cps @ -1.0°C 17.7 cps @ 76°C .3% New Single Shell 995 " " -1.0°C 16.0 " " 73.5°C .3% Old Double Shell 5050 " " -1.5°C 22.4 " " 75°C 1.9% New Double Shell 1763 " " -1.5°C 23.6 " " 76°C .3% Old Triple Shell 6200 " " -1.0°C 29.6 " " 75°C .1% New Triple Shell 3960 " " -1.5°C 30.7 " " 75°C .7% Old Aero Shell 9330 " " -1.5°C 38.7 " " 74°C .7% New Aero Shell 5200 " " -1.5°C 38.0 " " 75.5°C 1.4% ------------ | ||