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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).
Recommendation to use Hi-Press Oil for new Bentley rear axles due to pinion bearing failures caused by Whitmore's oil.

Identifier  ExFiles\Box 84\4\  scan0061
Date  3rd September 1935
  
x202

To Mx.{John H Maddocks - Chief Proving Officer}

Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}21/KW.3.9.35.

Bentley Rear Axle:

Even with the steel cage rear axle pinion bearing we are not entirely free from cage failures. We have reason to believe that the clogging effect of Whitmore's oil is conducive to insufficient lubrication at this point. As we have circulated a sheet for Hi-Press Oil, we recommend that all new axles are built with this from now on.

Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}
  
  


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