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).
Test using engine oil in the gearbox.
| Identifier | ExFiles\Box 5a\3\ 03-page223 | |
| Date | 13th May 1933 | |
| GRY{Shadwell Grylls} X5840. To Hs{Lord Ernest Hives - Chair}/Gry{Shadwell Grylls} From G.W.H. Hotel de France. Chateauroux. Indre. 18. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} IV. We have run with the engine oil in the Gear box. There is no increased whine or noise from the gears. The clutch stops just as readily. We are continuing to run with this oil G.W.H/ | ||