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 use of winter oil for Phantom III engines.
| Identifier | ExFiles\Box 145\3\ scan0073 | |
| Date | 21th December 1936 | |
| 12 35. S/W. Rm.{William Robotham - Chief Engineer} LE13/C/21.12.36. Re Phantom lll. Engine Oil. With reference to your Rm{William Robotham - Chief Engineer}5/R27.11.36., if you think it advisable for us to deliver cars with one of the Winter oils for the next few months, would you like to take this matter up with the Works and ask them to use this oil in engines instead of the thicker oil which they are at present using. J.H.R. | ||