You could try to add ~0.3% Tocopherol or L135 Antioxidant to increase the lifespan if the oil substantially in case it oxidises too fast
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Is tocopherol just vitamin e oil??
Yeah essentially the same, its a oily substance. Just don't use food quality supplements, but technical quality with high concentration, way cheaper. Its also used in the lubricant industry as AO for lubricants with possible food contact.