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).
Bench testing and standardisation of Duckham's winter and summer grade engine oils.
| Identifier | ExFiles\Box 145\3\ scan0058 | |
| Date | 10th November 1936 | |
| 01235 Sg.{Arthur F. Sidgreaves - MD} Rm{William Robotham - Chief Engineer}34/R.10.11.36. DUCKHAM'S OIL. Replying to Sg{Arthur F. Sidgreaves - MD}16/E9.11.36., if Mr. Duckham will submit to us a barrel of winter and summer grade oil which he would recommend as suitable for our engines we would run a bench test with a view to passing for standardisation. We are now adapting our engines so that they will use very thin oil in the winter, a model grade in this respect being mobil-arctic. Rm.{William Robotham - Chief Engineer} | ||