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).
Use of thin oil to prevent tappets sticking in cold weather and details of vehicle oil tests.
| Identifier | ExFiles\Box 101\2\ scan0184 | |
| Date | 27th November 1936 | |
| 1 5009 GWH.{George W. Hancock - Head Chateauroux}from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}15/R.27.11.36. We attach copy of telegram we have sent to Hamilton. On the P.III we are being forced to use very thin oil to avoid tappets sticking in cold weather. Though we intended that 6-B-IV should run the last 15,000 mil test on thin oil, we observe that it actually ran on Castrol XL. 22-G-V will give us an opportunity of getting results under the conditions which might apply to the customer, i.e., after considerable mileage on ordinary oil. Rm.{William Robotham - Chief Engineer} | ||