As long as the air remains dissolved in the oil, this generally is not a problem. Some mineral oils can have air content approaching 9 to 11 percent volume at atmospheric pressure and room temperature. This depends primarily on the gas solubility, but pressure and temperature also have an effect. Even if the oil is free of air bubbles, it will have a proportion of dissolved air. Whether during operation or storage in barrels, oils are constantly in an exchange process with their air-containing environment. Lubricating oils are not completely free of air.
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