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).
Claims and effectiveness of 'Miracle Oil' in preventing carbon buildup in engines.
| Identifier | ExFiles\Box 32\4\ Scan125 | |
| Date | 15th January 1923 | |
| X1588 H1/TB/15.1.23 S/W. Hs.{Lord Ernest Hives - Chair} from H.{Arthur M. Hanbury - Head Complaints} Re:- MIRACLE OIL. I do not want to trouble you with unnecessary correspondence, but I do want to get something comprehensive about this matter that can be used by the Inspecting Engineers about the country. I like the wording of the paragraph you suggest in your Hs{Lord Ernest Hives - Chair}4/LG13.1.23, but unless we say that our own tests have not turned out what is claimed for the oil, we fail to meet the biggest claim of all, which is, that if Miracle Oil be used, the engine never needs decarbonizing, because it is claimed that no carbon at all forms in the combustion space. It is a big claim, as you will see, and one which I, personally, do not believe. However, one does meet people with little engines who state that it is a fact. As some of our engines, especially Pre-War engines, carbon up very quickly, decarbonisation is ever present necessity in the minds of their owners, and they listen readily to this claim. My own feeling is that, if we added oil with the petrol on these cars, we should get an increase and not a decrease of carbon. Is there by chance anything in Miracle Oil which causes, for example, some slower burning, such as Benzol does, and prevents the formation of carbon? I am talking entirely in the dark, because I have never tried the stuff myself and I do not know over how many thousand miles you have tried it. H.{Arthur M. Hanbury - Head Complaints} [Stamp: RECEIVED JAN 16 1923 Hs{Lord Ernest Hives - Chair}] | ||