oil filters were originally there to prolong piston ring life

now oil filters allow hydraulic lifters to continue to operate

journal bearings are much more tolerant of particles in the oil, particularly carbon particles

i have never read a scientific paper that clearly shows whether finely filtered oil is the dominating factor that prolongs piston ring and bore wall wear rates,
or whether it is the film strength of the lube oil that dominates

i have read scientific papers from aircraft engine maker Continental that claimed that coolant temperatures around 200 F keep corrosive chemicals in the exhaust hot enough to be gases rather than hot liquid acids, and that this reduces corrosion and prolongs bore wall life