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).
Conclusion of an oil analysis report finding a gas engine oil unsuitable as a substitute for Castrol R.
| Identifier | ExFiles\Box 76\4\ scan0164 | |
| Date | 21th August 1919 guessed | |
| Contd. -2- 4. Conclusion. From the above it is seen that the oils are com- pounds containing 4% and 5% of fixed oil respectively. The Flash Points are both fairly low and the Viscosity of the Gas engine oil is very low, this would render it unsuitable for use in aero engines. The viscosity of Motorine C. is considerably lower than that of Castrol R and its setting point is much higher. It could not be re-commended as a good substitute for Castrol R.{Sir Henry Royce} on Rolls-Royce engines. -------------------- | ||