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).
Laboratory report comparing an unused and a used sample of 'Castrol' Oil.
| Identifier | ExFiles\Box 32\3\ Scan070 | |
| Date | 2nd February 1925 guessed | |
| Hs.{Lord Ernest Hives - Chair} for attention of Mr Warwick. X1583 H11/EF19824. Laboratory. Re 2 samples of "Castrol" Oil. No.1-unused, No. 2---used. Sample 1. Flash Point 225°C. Moisture 0.74% Acid 0.62% Sample 2. 185°C. 0.47% 0.89% The Fatty Acid is higher than usual, and this percentage in the presence of the moisture would tend to cause corrosion. The low Flash Point of the used castrol oil indicates the presence of about 0.10% Petrol. H1. | ||