Originally Posted by 2012 Summit
You need to take into consideration that the installation of the catch can modifies the built in oil separation system
Care to elaborate? The built-in separator is still part of the loop on most catch-can installation configurations. The only modification expected from the engine's perspective (aside from reduced oil in the PCV return) would be a slight loss of pressure. We know that the pressure is monitored by the ECM, so the drop cannot be excessive without a code being thrown.
I agree that it would be ideal if we had a systematic review of the carbon buildup on the intake and turbo on this engine after a decade of service plus hundreds of thousands of miles. Unfortunately, we still need to wait many years for that data.
Let me put it this way: if in 2023 we find out that these EcoDiesel intakes & turbos are still clean thanks to the built-in oil separator alone, I still
won't think the people who installed catch cans were suffering from paranoid delusions for trying to protect against buildup. If we find out the turbo is coked because the built-in separator is inadequate, then spending $200 on a catch can will seem like a bargain in retrospect.