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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 authorized standard and aeroplane engine oils with their viscosity, maker, color, and useful temperature range.

Identifier  ExFiles\Box 26\5\  Scan055
Date  7th May 1927 guessed
  
AUTHORIZED OILS - Continued

APPROX. VISCOSITY (Saybolt) @ 100°F.{Mr Friese} NAME & MAKER COLOR USEFUL DOWN TO THE FOLLOWING TEMPERATURE

1200 Castor Oil (medicinal) Water White 0°F.{Mr Friese}

1200 Wakefield Castrol "R" Pale Yellow -10°F.{Mr Friese}
C.C. Wakefield & Co. Ltd.

1100 Vacuum Mobiloil "B" Dark Amber 30°F.{Mr Friese}
The Vacuum Oil Co.

900 Gulf Supreme Auto Extra Heavy Dark Amber 10°F.{Mr Friese}
The Gulf Refining Co.

850 Wakefield Castrol XL Dark Amber 30°F.{Mr Friese}
C.C. Wakefield & Co. Ltd.

800 Vacuum Mobiloil "BB" Dark Amber 30°F.{Mr Friese}
The Vacuum Oil Co.

700
and
under - Medium Motor Oils of Various Colors and Viscosities.

AEROPLANE ENGINE OILS

1800 Gulf 120 Aero Oil Dark 30°F.{Mr Friese}
The Gulf Refining Co.

2000 Sinclair Liberty Aero Oil Dark 30°F.{Mr Friese}
Sinclair Consolidated Oil Corp.

1800 Caspar Aero Oil Dark 30°F.{Mr Friese}
Caspar Oil Company

1800 Socony Aircraft #4 Dark Amber 30°F.{Mr Friese}
Standard Oil Co. of N.Y.

In localities where the temperature remains far below zero for considerable periods, oils are usually available having good fluidity at these low temperatures. Such oils are suitable only during the persistence of cold spells, as they are much too thin for temperatures above zero.

Bijur Lubricating Corporation furnishes an oil especially adapted to such low temperature conditions.
  
  


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