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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).
Lab report on Caspar Oil following a one-hundred-hour non-stop motor run.

Identifier  ExFiles\Box 32\4\  Scan194
Date  22th November 1923 guessed
  
New York Testing Laboratories
80 WASHINGTON STREET, NEW YORK CITY

Sheet No. 1
Lab. No. X-15278
Report No. X-15280

Report on Caspar Oil
during one hundred hours
non-stop motor run

Made for Caspar Lubricants, Inc., 1819 Broadway,
New York City.

A stock touring car, equipped with solid rubber tires, was supplied with six quarts of Heavy Caspar Oil and then sealed. The car was then driven continuously for one hundred hours and thirty five minutes throughout the Metropolitan district. At no time was fresh oil added to the car and at no time did the oil fall below pressure. During this test the car covered 1301 miles. However, this in no way describes the full use made of the oil, as at numerous times the car was stopped because of traffic, etc., but the motor was run continuously throughout the trip.

After the run had been completed, the oil was removed from the car personally by the writer and carefully measured. A full two and three quarters quarts were well drawn. The oil was slightly warm, approximately 85 to 90 degrees F.{Mr Friese} and appeared to have held its original consistency, being noticeably free from the dilution with gasoline, as is often found in other lubricating oils when put to even much lesser tests. After measuring the oil, it was placed in a container and then sealed by the writer and delivered to our laboratories for comparative tests with the original oil. The following figures give at a glance the comparative values of the oils.

X-15280 X-15278
Original Used Oil

Specific Gravity
at 15.5 deg. C .896 .895
Flash Point 448 deg F.{Mr Friese} 216 deg F.{Mr Friese}
Fire Point 476 " " 398 " "
Cold Test 31 " " 23 " "
Viscosity at 100 deg F.{Mr Friese} 593 sec. 435 sec.
Viscosity at 310 deg F.{Mr Friese} 76 " " 67 " "
Light Oil Dilution 2½%
Filterable precipitation,
contamination such as
carbon, etc. .005%
  
  


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