Prior UOA: https://bobistheoilguy.com/forums/threads/2017-mazda-cx9-2-5t-pup-5w-30-4-858-miles.312127/
Cylinder head was replaced at 60K so the entire engine was resealed. Common issue for the early Mazda 2.5T engines. This is probably driving the high Si reading.
This was the @High Performance Lubricants PCMO 5W40, not the Euro version.