I have always used iron levels as an indicator, not a problem in itself (adding to a wear issue or causing other wear).
In a combustion engine (particularly diesel) is there any research that indicates that there is a point where iron in the oil contributes to wear?
If so, at what level?
I am hearing of moves to filter it, and that makes no sense if it does no damage, and you then loose your indicator because its being filters out/
Last question, how large is an iron particle?
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