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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).
Page 2 of a report comparing oil properties and providing recommendations on oil sourcing and fault handling.

Identifier  ExFiles\Box 32\4\  Scan200
Date  27th January 1925 guessed
  
contd :- -2-

Fatty oil content - 'C' 4.7% 'BB' 0.80%
Total acidity - 0.3% 0.17%
Mineral acids - Negligible. Negligible.

We have not experienced piston squawks on experimental 20 HP. cars, neither was it reported in the 10,000 miles test on production cars.

If we use a mineral oil we should recommend we buy from a British Firm; both Vacuum and Valvoline are U.S.A. Firms.

We also recommend that if we have a fault which is due to the oil, we should take the matter up with Prices before condemning their product.

Hs.{Lord Ernest Hives - Chair}
  
  


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