Hi Ismael53, what a good subject has raised. My opinion is that you do well, change those microfilters to regular interbal. My option is based on:
engine oil filters at best at the best part of the order of 10 to 20 microns up, microfilters can catch much smaller impurities of 3 to 5 microns.
Due to the engine tolerances (coginetes, cylinder piston) are greater than the tole that modern turbochargers have in their buds, only the filtering made by the main filter is not enough, producing impurities in this part of the turbo.
The other is the oil filters have an internal by pass valve, when the filter, in the previous stage to the oil change, is already very filled with dirt that by pass opens, thus preventing the engine from being with little irrigation, a necessary evil, not so daniño for the engine, as if for the turbo, in those cases in my opinion that microfilter is essential that prevents great impurities from being impaired. Motor, producing damage to this, are lethal for turbo bearings. I have a good friend who works in Mining engines and tells me that they, apart from microfiltrate of the engine oil use specific microfilters for the turbo, giving this long -term reliability, apart from them they do studies to the oil of the engines and according to their opinion, when using lubricants of the very low viscosity, due to the thick Prone to premature wear due to impurities not filtered by the main filter, such as the necessary microfiltrate of the Oil gas in Common Rail systems, you already know that pumps have very small tolerances and the infamous holes. Pequñas and manageable by an engine, but "large" and unmanageable for that area of the turbo, based on removing those microfilters.