5 quarts in rear diff of '23 TRD OR?

I did a good bit of research and decided to use 75w90 Valvoline or SuperTech. In my case I went with SuperTech. There's plenty of evidence that supports using this IMO. Bob the Oil guy did a study and rated the SuperTech stuff well.

I also agree that doing the first diff change early is a good idea. I intended to do mine at 5k but didn't make it happen until 15k.

 

I did the same, didn't expect to find this big chunk that was leftover from when the housing was drilled, but glad it's out

 

Wow. I found a small metal chip along with the regular buld up on the magnet. Like you, glad to have it out of there.