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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).
List of required properties for oil used in a central lubrication system.

Identifier  ExFiles\Box 27\1\  Scan169
Date  19th April 1929 guessed
  
contd :- -3-

pipe lines, by a straight mineral oil, such as Mobiloil, to
prevent corrosion. This mineral oil can then be used until
the pump requires filling again, when the car is next used.

Summing up, we should say that the properties
of an oil which make it acceptable for use on a central
lubrication system are :-

(1) It should have well-known lubricative properties.
(2) It should have a moderately high viscosity figure
at a normal temperature.
(3) It should maintain its mobility at a low temperature.
(4) It should not corrode the pipe lines or drip plugs.
(5) It should preferably be clear and must be free from
wax or other solvent. In addition the :

the companies who supply it should be in a position to
furnish us all over the world.


Appended are results of certain laboratory
tests in connection with the above.


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