Catch cans are the standard mitigation. I don’t personally like them but some (provent?) are actually engineered to perform the function of eliminating oil in the intake. They don’t however, limit the contaminants from egr systems and the aforementioned “no fuel in the intake”. For those, water/meth injection is the preference.

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- Tom
‘10 E70 diesel, hud, hot/cold weather, 3rd row.