The MaxxForce 13 uses a spinning "squirrel cage" separator driven by oil pressure to fling oil droplets out of the crankcase gases.
The MaxxForce 13 engine, manufactured by Navistar, is well-known for its complex emissions systems, and the is a frequent source of trouble. When this system fails, it often leads to excessive oil being expelled through the road draft (blow-by) tube. Common Crankcase Breather Problems Failing Centrifugal Separator (Squirrel Cage) maxxforce 13 crankcase breather problems
High crankcase pressure from worn rings can overwhelm even a functional breather, pushing oil and vapor out of every available seal and the draft tube. Key Symptoms to Watch For The MaxxForce 13 uses a spinning "squirrel cage"