I have important information. Apparently the admech had a little uprising in the 800s when some magi got so tech brained about lubrication that they decided to found a militant splinter cult and go to war with the rest of the mechanicus. Again. This is because they got really obsessed with lube.
Genuinely one of my favorite lore nuggets I've stumbled on in a hot minute. One of my least favorite reoccuring tropes in 40k is how the Imperium's internal problems aways turn out to largely be the fault of some external force (usually chaos, sometimes genestealers, very occasionally some other xenos looking to make trouble) meddling behind the scenes. Heresy should *rarely* be actual chaos worship or tyranid mutant fuckery, more often its just a bunch of dogmatic weirdos with too many guns and strong opinions about Vaseline that decide the nonbelievers have to die because that's what they've been told all their life anyways, just now it's over lube and the non believers are the next workshop over because tech priests get way to invested in their tech.
Forge Mistress Mari Lwyd
"Forge Mistress Mari Lwyd partakes in some Sanguinala festivities. Despite her position, the Forge Mistress is surprisingly outgoing for a member of the Mechanicus. Some may attribute this to her forge world's main product, Amasec... but whether or not this is the truth, the workers of her factories are some of the happiest in the imperium. On special occasions the Forge Mistress even pays a visit to her various factorums, even reputing to have been known to have bouts of what may pass for singing."