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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).
Test report from the New York Testing Laboratories summarizing the performance of Caspor Oil.

Identifier  ExFiles\Box 32\4\  Scan195
Date  22th November 1923 guessed
  
New York Testing Laboratories
80 WASHINGTON STREET, NEW YORK CITY

Sheet No. 2
Lab. No. X-15278
Report No. X-15280

Summing up the above results, it is our belief that the performance of the Caspor Oil used in this test has been remarkable. The oil showed very little deterioration other than the slight dilution with gasoline. However this dilution with a small amount of gasoline is compensated for by the gradual but slow thickening of Castor Oil used in the preparation of the Caspor Oil. It is my opinion that a straight mineral oil used under such conditions gradually becomes thinner, and undoubtedly figures obtained under the same test would show a very marked decline from the original oil figures.

Taking into consideration the severe driving conditions in and around New York, congestion of traffic, solid tires, continual running of the motor for one hundred hours, it is my belief that Caspor Oil has shown itself exceedingly well. It is also the writer's belief that the same used oil could be placed back in the same motor and run on for another hundred hours with very little deterioration.

NEW YORK TESTING LABORATORIES
Per S. Brinton Jack Jr.{Mr James Royce}
Director of Tests & Inspection
  
  


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