The MMO thins out the Oil and might interfere with the chemical Mechanism that makes Multi Viscosity Oil Multi Viscosity.
Diesel Engines are harder on the Oil that a Gasser is.

In the Past when MMO first came out there was no Multi Viscosity Oils. It did not matter if you put a bit of MMO in 30wt Oil and thinned it a little; and the older Oils did not clean as well as the more modren ones do.

If you want a cleaner Engine innards You could switch to synthetic Oil.

If you want less Engine wear from particles You could install a Bypass Oil Filter.

Concerning the subjective weight of the Oil Filter. You have assumed the weight is unwanted crud; how do you know the weight is not made up of tiny Metal Particles from increased wear on the Metal Parts?

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84 300D, 82 Volvo 244Gl Diesel