[Kube]

I have never, not even once, had an issue.
Perhaps the lubricant is taking the path of least resistance? IE your spring is clogged and won't allow the lubricant to flow properly.
If grease has been pumped in prior, it will clog rather quickly. Even the use of the proper lubricant dries and hardens through the past decades.
I have taken many NOS springs apart for my restorations and found each and every one was dried up and had to scrape the "stuff" out before bead blasting and powder finishing the individual leaf's.