I always threw away the oil cap: a colleague explained to me what it was actually for.

Controlling the Amount of Oil to Use
When you want to prepare a recipe that only requires a drizzle of oil, it can be difficult to control the amount that flows from the bottle. As a result, you always end up putting more than you need. But thanks to the plastic tab inside the bottle, below the cap, this problem will be quickly solved.
Indeed, the small ring allows you to partially block the spout of the bottle, and therefore, to more easily control the amount of oil to pour. This way, you can pour this liquid without losing a single drop. Pretty practical, right!?

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However, be careful not to press too hard on the tab so as not to push it inside the bottle. To do this, simply press gently and lightly.

Avoiding Oil Splatters and Waste
You’ve probably already poured oil into a pan or onto food you’re cooking, only to accidentally squeeze the bottle too hard, pouring too much oil. The result? You end up with splatters everywhere, including on your clothes and the stovetop.

In this case, simply remove the ring and replace it upside down to prevent any risk of waste or splashing. This will save you money and prevent this type of accident.