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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).
Suitability of Shell-de-Luxe and Shell super-light engine oils.

Identifier  ExFiles\Box 32\4\  Scan236
Date  12th April 1926
  
W/S.
To Sg.{Arthur F. Sidgreaves - MD} from Hs.{Lord Ernest Hives - Chair}

SHELL-DE-LUXE.

X1588
X1588
X976

With reference to Pt3/Mi22.2.26 attached to Sg{Arthur F. Sidgreaves - MD}15/BM7426.
At the moment we are not in a position to recommend Shell-de-Luxe.
The oil which Mr. Royce mentioned was Shell super-light.
This oil is very suitable for high efficiency engines and does reduce the friction losses of an engine. From our experience it does also increase the amount of noise.
We should like to know what oils customers have been using when they say they get an improvement with Shell.

Hs.{Lord Ernest Hives - Chair}
  
  


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