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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).
Letter from Price's Lubricants Ltd. regarding their recommendation to use compound fatty oil for rust prevention in engines that are laid up.

Identifier  ExFiles\Box 144\1\  scan0295
Date  15th January 1940
  
PRICE'S LUBRICANTS LTD.,
BELMONT WORKS,
BATTERSEA,
LONDON.S.W.11.

JWGB/VHG.

15th January, 1940.

To: Messrs. Rolls-Royce Ltd.,
DERBY.

YOUR REF: Hd{Mr Hayward/Mr Huddy}/Sd9/MW13.1.40.

Dear Sirs,

We have your letter of the 13th instant., and note your reference to a recommendation of yours that when cars are laid up it is desirable that the crank cases should be emptied of used oil and refilled with the proper quantity of lubricating oil of pure mineral character.

The point has already been put to us by several Rolls owners, and we would advise you that in each case we have advocated a continuance of the use of Motorine. Whilst compound in character there is nothing whatever in Motorine likely to cause the slightest harm even in an engine laid up for a considerable period of time. The fatty matter is innocuous but valuable from the point of view of maintaining a better film over all surfaces. The ordinary mineral oil will run off after a time and tend to leave surfaces unprotected. Fatty oil on the other hand is more persisting in that it is appreciably attached to metallic surfaces. It has no harmful oxidising or corrosive effect whatever, but drains off less freely and is more difficult to remove. As bearing specifically on this point we would instance our Rust Proofing Oil which contains a proportion of fatty oil of very much the same character as we use for Motorines. This particular Rust Proofing Oil was evolved about 25 years ago, and nowadays is very widely used in several industries including the manufacture of ball and roller bearings. It is ideal as a preservative against rust, and is more effective in this direction than any pure mineral.

We might conclude our arguments by mentioning that we were pioneers in the blending of fatty oils with pure minerals for lubrication and rust proofing purposes and our experience in these matters goes back more than 50 years. If there is any impression that a compound oil has a deleterious effect, such impression certainly does not arise in connection with our products. In our opinion
  
  


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