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).
Recommending a change in gear oil, standardizing 'Amber A' for axles and gearboxes on both 20 HP and Phantom models.
| Identifier | ExFiles\Box 72\1\ scan0138 | |
| Date | 23th December 1926 | |
| To BY.{R.W. Bailey - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to Mx.{John H Maddocks - Chief Proving Officer} c. to Hm.{Capt. W. Hallam - Head Repairs} Hs{Lord Ernest Hives - Chair}2/LG23.12.26. X5980 GEAR OIL. At the present time we recommend thick Amber 'B' gear oil for the 20 HP., whereas for the Phantom we recommend thin Amber 'A' oil. We recommend that Amber 'A' is used as standard on both cars all the year round, for axles and gearboxes. All Depots should be instructed accordingly, and alteration should be made in the Instruction Book. Hs.{Lord Ernest Hives - Chair} | ||