those last few pics looks like elecyrolyzed coolant to me. the minerals appear to make paths and lots of pitting like water spots. if you can get a good multimeter, you could test some spots for conductivity under the scope. the dry side vs wet side really tells a story. i would think an aegis ring ...

Howard, are you thinking the debris are causing the seal failures at this point? It would seem that the triple lip might hold back some of the debris floating around the du, including the dirt and grease. even though i dont appear to have coolant failure, this grease is quite thick from the bearings...

I'm interested in the custom seal too. 2013 model S P85 here that has 20k on the model q DU from 2020. I have been pondering Tesla's the use of the coolant in the DU's instead of traditional hydraulic fluid or oils, which have much higher viscosity and would likely leak less on a seal in this situat...