You have to perform destructive test for the initial production parts and sacrifice first 1 or 2 parts with destructive testing. there is no other way, you need to have cut ups from the parts and evaluate the results.
To have a general idea about the requirements you may check NADCAP site, used...
I try to check SAE J1926 from net, and Ted is right about the shape of the surface, however it will depend on the mating surface of your assembly. I mean if mating surface is a flat surface, this may solve your question.
please note that when o-rings are used in such assemblies results usually...
As far as I know wear observed in car engines are due to piston movements in first runs. Bearings should not be damaged, or any loose of material from the bearing should not realized.
If particles observed are bigger than the filter that means there is problem in the engine. In that case a...