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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).
The lubricating properties and performance of paraffin base hydrocarbons in petrol engines.

Identifier  ExFiles\Box 32\4\  Scan275
Date  5th October 1928 guessed
  
2.
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The paraffin base hydrocarbons are good under less trying conditions, but it appears that they lack something for complete lubrication of a petrol engine - I should say this is due, as you state, to high cold set and also :-
(1) Relatively poor resistance to cylinder heat, and the tendency to production of rather a hard carbonaceous film.
(2) Poor lubricating value under boundary lubrication conditions.

With respect to the medicatXed paraffin. The samples we have tried show a rather wide boiling point range of constituents. These appear to be largely paraffin hydrocarbons. Oxidation is, nevertheless, rather rapid, and the material is a very poor lubricant.

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