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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).
The choice of lubricating oils for the 3½ Litre Bentley.

Identifier  ExFiles\Box 145\1\  scan0036
Date  12th September 1933
  
Hs.{Lord Ernest Hives - Chair} from Mx.{John H Maddocks - Chief Proving Officer}

3½ Litre Bentley – Lubricating Oils.

Can you tell me whether a decision was arrived at with regard to the brands of oils to be used?

Assuming that Vacuum Oils are to be used, do you consider it advisable that the correct grades for the various units should be put into the 15 Bentleys which we are now dealing with. If you consider this should be done will you please let me know what the correct grades are.

Mx{John H Maddocks - Chief Proving Officer}
  
  


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