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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).
Letter to M. Wilks of The Rover Company Ltd., regarding the type of oil used in aero engines.

Identifier  ExFiles\Box 27\3\  Scan205
Date  5th October 1939
  
8

Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}4/MH.{M. Huckerby}

5th. October, 1939.

M.{Mr Moon / Mr Moore} Wilks, Esq.,
The Rover Company Ltd.,
New Meteor Works,
COVENTRY.

Dear Wilks,

With regard to your telephone query, we do not run our aero engines in on castor oil but use DTD.109. We have found that the best brew of this is made by Silvertown, particularly as regards cleanliness.

Thank you for the gearbox information.

Yours sincerely,
  
  


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