Apologies for the horrible grammar, typos, and just poor wording in some parts of this paper (not mine!). But, from what I gather, oil in PCV system is mainly driven by 4 things, none of which are specifically oil-related: engine speed, piston/piston ring design, cylinder liner temperature, and and oil level (entrainment in the crankcase). NOACK is not mentioned by name but by action (high temperature evaporation of lighter species of engine oil), but it seems to be a very minor component; according to this study, only about 7% of an engine's oil consumption is through the PCV system. In other words, the NOACK of an oil carries almost no effect on the dirtying of the intake side of an engine when compared to the design and use of said engine.
Quote:
it is believed that most of the larger particles are believed to come from the crankcase, while the smaller particles are
from the atomization of the oil by the high speed gas flows under the small clearances in the ring gap.
PCV effects on oil consumption
Quote:
it is believed that most of the larger particles are believed to come from the crankcase, while the smaller particles are
from the atomization of the oil by the high speed gas flows under the small clearances in the ring gap.
PCV effects on oil consumption