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).
Report comparing used Castrolite oil from an S.S.V. Bentley test engine with standard Castrolite oil.
| Identifier | ExFiles\Box 97\5\ scan0218 | |
| Date | 9th June 1939 | |
| RM{William Robotham - Chief Engineer}/IMV.9/RH.{R. Hollingworth}9.6.39. CASTROLITE OIL FROM S.S.V. BENTLEY. Copy of Messrs. Wakefield's Report. Oil ex test Standard engine. Castrolite. Specific gravity .877 .877 Viscosity at 70°F 11' 8" 12' 30" Viscosity at 140°F 1' 48" 1' 55" Fatty oil Nil Nil Acidity 0.34 mgm KOH/gm oil Matter insoluble in petrol ether 0.10% Ash 0.08% Dilution 6% Colour Dark brown 14. Light red 6. These figures are self-explanatory. There is obviously a reduction in viscosity due to petrol dilution. We should not regard 6% of petrol as excessive. True, it is usually between 3 and 5% but obviously there is not much difference between 5 and 6%. The insoluble matter is extremely small. Our opinion is that the oil is in very good condition, assuming that Castrolite is a suitable oil for the engine in which it has been run. This qualification is necessary, because if Castrolite should happen to be thin for the job a little further reduction in viscosity might become serious. | ||