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).
Log of mileage and observations on the performance of a felt filter (Castrol XL).
| Identifier | ExFiles\Box 83\2\ scan0053 | |
| Date | 28th May 1937 | |
| -2- 28.5.37. Speedo. 3.B.IV. (CASTROL XL.) Reading. Felt Filter (Not cleanable). 2320. New element fitted. Oil changed. No sludge an element discarded. 8081.* Element inspected. No sludge. Replaced in filter body changed from 6.B.IV. 4361 miles since last inspected. 16058. Car left Chateauroux. 7977 miles since inspecting filter. 16832. Car in Shop. Filter completely sludged up after 14,512 miles. Oil in sump unchanged during this mileage. ALL BEARINGS IN VERY GOOD CONDITION. Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} | ||