I don't think you will hear so many here at BITOG, telling about their experience with it.
The reason is simply because last time someone told about their experience, the flat-earthers crowded out of their closets, eager to show how smart they were, when they didn't dare to try it.
Back then, it was called Cermax.
Now, there is at least one ceramic additive, that has TÜV approval.
And also another additive that does similar things (but better)like the ceramic additives, have the TÜV testing.