Skyship, yes we carry out a full analysis at 25hr intervals and have a live particle counter in the system all the time.
I still don't understand how you have established dirty filters are better than clean which was my question and how this has been established.
As already mentioned there are to many variables with one engine or duty cycles to establish real effects unless conducted over test conditions.
I'm not sure if you work in tribology or the oil industry or are quoting on your own vehicle?
I have worked for many engine manufacturers throughout my carear and all practices for each are very similar. Most of the best by German and American manufacturers.
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