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).
Query regarding the suitability of Castrol 'XXL' oil for Bentley engines during summer.
| Identifier | ExFiles\Box 145\2\ scan0032 | |
| Date | 22th May 1934 | |
| To "Rm{William Robotham - Chief Engineer}" Derby Showrooms Sr/EWP{Mr Punt}8/MLG.22.5.34 Re: Bentley Would you please let us know whether you consider the use of Castrol "XXL" oil advisable in the Bentley engine during summer time temperature. Mr. E.{Mr Elliott - Chief Engineer} R.{Sir Henry Royce} Hall told us when he passed through Paris from Italy that he found a considerable economy in consumption by "XXL" as compared with "XL" and it would be interesting to have your views on the subject. "Sr" | ||