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 the properties of used and unused Castrolite oil from a French Test Bentley.
| Identifier | ExFiles\Box 97\5\ scan0219 | |
| Date | 1st June 1939 | |
| COPY. RM{William Robotham - Chief Engineer}/IMG. H1/BPS.1/JE.S.6.39. R.R Laboratory Report 4860. Re: Castrolite Oil used in French Test Bentley. Your Ref. RM{William Robotham - Chief Engineer}/IMR.7/JE.5.5.39. Herewith results of our examination of the used Castrolite, unused Castrolite and the deposits which you submitted. Used. Unused. Open flash point °C......... 245 243. Organic acidity (oleic %).... 0.11 0.11 Saponification value %....... 0.22 0.15 Pour point °C............... -42 -41 Sulphur (Copper strip method.. Satisfactory. Satisfactory. Ash content............... 0.038 0.023 Analysis of ash........... Chiefly iron Chiefly iron oxide. oxide. Viscosity curves and specific gravity- temperature results are appended herewith. Compared with the unused oil, the used oil has suffered very little change, and should give satisfactory results if employed again. Deposits. Each of these consisted of carbon and iron oxide; the following are the amounts of carbon found:- Cont'd........ | ||