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It could be break-in related. That said - in a perfectly machined, and perfectly cleanly assembled engine - assuming it is primed correctly, etc - there *should* be NO break-in except for rings - which would be cast iron, steel, and I think the top compression ring is plasma-moly (100% molybdenum) coated..... there's really nothing in an engine that *should* wear that contains silicon. The bearings should float on a film of engine oil and continued excess silicon in my opinion is an indication of sloppy clearance, assembly, or cleanliness. It may wear to a point and plateau there for a very long time - or it may just eat itself in short order. It's really hard to say - continue to do analysis and watch the trends. GD

Important to note here that "Silicon" is different than "Silicone" (often found in engine sealants) and also different than "Silica" (which is often found in sand and dust) - these are all different materials with different properties. Silicon is used in the BiMetal bearings Subaru uses for the connecting rod and main bearings: https://www.aclus.com/bimetal-bearings-characteristics.html Having seen the a few of these reman engines fail, and given the track record of this particular vehicle and the dealer doing the repairs - I would guess accelerated bearing wear is the reason for the high silicon. Might be minimal and clear up with more miles, or it might eventually throw a rod. We had one of those engines blow at about 13k miles. GD