I have had this tube of MX4 since 2013, it’s served me well, countless rebuilds of my computers, CPUs and GPUs alike, home servers, gaming computers, laptops, games consoles, pi4, I used this on everything. You served me well.
8th June 2013 to 4th November 2023.
This has been my experience with MX-4 as well. It’s really really really stable. I’ve never had to re-apply MX-4 due to it drying out, either. (It’s supposed to last at least 8 years in use.)
The same tube has been sitting in my drawer and every time I’ve needed it, every few years, it’s been good.