Deleting is the CCV filter is pretty common once you take the CAC and intake apart and find out what a mess it makes. The design is pushing oil vapor into the intake side of the turbo, it isn't hard to figure out what a mess that can make. No matter how good the filter it will NOT remove all the oil from normal crank case outputs, all that will eventually be squeezed out in the compressor and CAC and then dumped into the intake fouling the sensors and the grid heater.
You really ask WHY? How about so there isn't raw oil building up on a grid heater that gets hot enough to fire it off, fouling some expensive sensors, and coating the CAC internally. It was and is a stupid cheap system to meet emissions.
You really ask WHY? How about so there isn't raw oil building up on a grid heater that gets hot enough to fire it off, fouling some expensive sensors, and coating the CAC internally. It was and is a stupid cheap system to meet emissions.