In article , (TripFarmer)
writes:

Yes we have a filter. Still can't figure out the reason for higher
tin levels.


The trouble shooting guide from Cleve Tech Center re oil analysis says:

TIN (Sn)

Origin Bearings, Pistons

Purpose Tin is a conforming material used to plate and protect surfaces to
facilitate break-in.

Maybe there is no problem with tin during the break-in.

Chuck