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).
Investigating the use of thin oils in Bentley engines and noting oil brand usage by owners.
| Identifier | ExFiles\Box 114\3\ scan0089 | |
| Date | 4th May 1938 | |
| Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}17/G.4.5.38. RE: THE USE OF THIN OILS ON BENTLEY ENGINES. Further to my memo ref. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}8/G.4.5.38. the use of thin oils have been investigated, and are as follows :- Rebores. There are 32 owners uwing Prices M.{Mr Moon / Mr Moore} after rebores, and 5 owners using Castrol CW. The wear of these bores will be carefully noted :- New Cars Prices M.{Mr Moon / Mr Moore} 6 owners. Castrol CW. 1 " Duckhams 1 " Mobiloil 1 " Comparatively new cars. Prices M 7 owners. Castrol CW.3 " Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||