The mfg must prove that the oil you used caused the damage. There is a law out there on that I think it's called the Magnussium law (not sure on that spelling) but it's been around for years.
As I mentioned before your best bet is to get a UOA as there are a lot of engine assembly lubes that are still being cleaned out. Plus a UOA will tell you if the metal wear is damaging or normal for the engine during break in and if the rings and pistons are seating.
g/l
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