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).
Engine R.P.M. tests conducted with various oil types at low temperatures.
| Identifier | ExFiles\Box 151\3\ scan0337 | |
| Date | 10th December 1937 | |
| -2- Rm {William Robotham - Chief Engineer} /FD. {Frank Dodd - Bodies} 3/MH. {M. Huckerby} 10.12.37. 8°F oil temperature using a winter oil, provided the battery is O.K. With the sump oil temperature at 8°F the following engine R.P.M. were taken on Mobiloil Arctic - 100 Castrol CW. - 70 - 75 Castrol AA. {D. Abbot Anderson} - 70 - 75 Shell Light - 40 Duckham's N.P.XX. - 30 A test on Summer oil, Castrol XL, shows that we can start easily with the oil temperature down to 23°F lower than this a start is made but takes longer. Rm {William Robotham - Chief Engineer} /FD. {Frank Dodd - Bodies} | ||