Is it normal to have a layer of oil on top of the wine in a barrel?

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I learned with my friends an ancient text about being polite and kind, and it talked about barrels of wine having a layer of oil on top.
Was it ever a normal practice? Does it have a reason?

For 15 years, Athan Zafirov has traveled the vineyards around the world and worked with some of the greatest chefs including Francois Duc and Alan Brown.
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