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 Vacuum BB oil as an alternative, as no tests have been conducted on Vacuum A oil.
| Identifier | ExFiles\Box 32\4\ Scan280 | |
| Date | 29th April 1929 | |
| To BP. from Hs.{Lord Ernest Hives - Chair} X1388 Hs{Lord Ernest Hives - Chair}1/LG29.4.29. X967 With reference to the attached. We have carried out no tests on Vacuum A.{Mr Adams} oil. Springfield recommend Vacuum BB. as an alternative oil and frequently when running cars on the Continent and no other oil has been available we have used Vacuum BB. We have had no experience with Vacuum 'A' so cannot make any recommendations. Hs.{Lord Ernest Hives - Chair} | ||