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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 specific viscosity 50 oils for the Phantom III 'D' series gearbox.

Identifier  ExFiles\Box 145\3\  scan0184
Date  24th May 1938
  
γ 1235

To NW.{N. Walker - Patents} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}
c. By.{R.W. Bailey - Chief Engineer}

Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}2/MH.{M. Huckerby}24.5.38.

P.III 'D' SERIES OILS.

With regard to NW.{N. Walker - Patents}13/VL.{V. Lewis / Mr Valentine}9.5.38, we recommend this should be the same as Bentley 'M' series except that the gearbox should run on -
Castrol XXL
or Vacuum BB
or Price's C
or Shell Triple.

these all being viscosity 50 oils.

Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}
  
  


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