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).
Test report on the performance of Price's Heavy Gas engine oil, noting no improvement in consumption but easier cold starts.
| Identifier | ExFiles\Box 16\1\ Scan002 | |
| Date | 26th February 1909 | |
| ENGINE LUBRICATION Made a test on engine with Price's Heavy Gas engine oil on the road and on the dynamometer for the purpose of noting whether the consumption was was improved by doing so. No improvement was made the only difference was in the fact that the engine was a bit freer to turn when starting up from cold. | ||