[AdrianE36]

In my own experience, I've went through 5 new Valvetronic gaskets since 2019:

Vaico- Came with the valve cover and started leaking after a month.

Victor Reinz- used RTV during installation and still leaked after a month

Genuine BMW- used rubber cement (would not recommend) and stayed leak free...for 6 months....I just cleaned up any oil buildup once a week for the next 2.5 years.

Elring- I switched to the eBay Mitzone aluminum valve cover 2 years ago and, much to my surprise, that gasket never leaked. When I had to replace my Valvetronic actuator back in February, it was still dry as a bone. Replaced it with another Elring gasket.