In the first part of this article in our September issue, DR. SELLEI dealt with the practical side of engine preservative oil evaluation. In this contribution, she discusses the most important papers covering the theoretical considerations. Engine preservative oils, used for the double purpose of preservation and lubrication, are evaluated as rust preventives and also as lubricants. By carrying the accelerated rusting tests, such as the humidity test, beyond specification limits a method was found which shows the merit of the oils tested and rates them according to their potential rust preventive performance. For evaluating the lubricating performance, engine tests are necessary. Preliminary screening with the Underwood machine and the one cylinder Lauson engine is recommended. A brief summary of the theoretical background of corrosion prevention is presented, with reference to correlation between theoretical considerations and humidity protection.
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