It is strange that so many own a 1DX but haven't come forward as to having the problem.
Have any of those who have posted had a problem?
Google it. You will see hundreds of forum posts from all around the world about dirty sensor and oil but not a single thing about what is described in the service advisory.
I think they found it before it caused a serious problem but the workaround they are doing is actually doing more damage to us.
80-90% of the users are professionals, I really do not want to worry about oil in my photos when I upload them.