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).
100-mile test comparing MOBILOIL A and MOBILOIL ARCTIC, recording oil consumption, engine characteristics, and pressures.
| Identifier | ExFiles\Box 100\3\ scan0132 | |
| Date | 22th September 1938 | |
| Chassis No. B82.G.A. MILEAGE 35,481. 100 mile test on MOBILOIL A.{Mr Adams} Oil consumption 400 m.p.g. No roughness in engine, except bearing thump, noticeable in all gears from 1,500 to 2,700 revs. Oil pressures:- 5 lbs idling. 16 lbs at 30 m.p.h. 23 lbs at 60 m.p.h. 26 lbs at 80 m.p.h. 29 lbs at 90 m.p.h 100 Mile test on MOBILOIL ARCTIC Oil consumption 320 m.p.g. Still no roughness in engine, but thump is more noticeable. Oil pressures:- 3 lbs idling. 12 lbs at 30 m.p.h. 18 lbs at 60 m.p.h. 22 lbs at 80 m.p.h. 23 lbs at 90 m.p.h. All oil pressures taken after doing 90 m.p.h. Water temp; according to thermo on car, normal running 65 to 68° C, when fast driving 70° C. -:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-: 22/9/38. | ||