Hello,
First of all you need to make sure that the oil is at the correct level by regularly checking it. Do not wait until the low oil light comes on.
I have attached the oil level checking procedure for your BMW (look below).
As for the valve cover gasket replacement, it should be replaced as soon as you are able to. It is not ideal to let a leak go on for extended period of time. As that can lead to other issues.
https://www.2carpros.com/articles/replace-valve-cover-gasket
Replacing the valve cover gasket is not terribly difficult. It can be done in few hours, depending on your comfort level.
I have included the valve cover gasket replacement procedure for your reference.
Please let me know of any questions.
Thank you.
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Monday, September 20th, 2021 AT 8:16 AM