I was speaking of some I wish I had some Test Equipment where you put in X sized Particles and amount of Particles and pumped them with Oil through the Filter and could measure what comes out after it has gone through the Filter.

I have not developed enough interest in the issues involved to have MY Oil tested; or, want the expense.
I figure if I put a Filter on that is calimed to filter down to a nominal 0.5 that it has to be doing some good. even though I cannot prove it.

Ebay also sells some fittings with Metric threads and US type connections on the other end and they often have free shipping.

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84 300D, 82 Volvo 244Gl Diesel