IMO catch cans are not needed on Gen 4's and results using them could be misleading.
If your catch can is full what is the oil % that is the big number. Gas in the PVC gets reburned no issue for the engine.
In high climate areas the nature of the metal catch can will collect condensation. Without it condensation would be burned in the engine which is no big deal either. So just because there is gas in the catch can over a long period of time does not mean it prevented any sludge from going in the engine. Unless you can derive the exact oil content its impossible to know the value.
Also if it was a lot of oil in the PVC then these engines would be running low on oil every month.
Also what is the impact towards warranty and altering the emission systems. Some states its illegal to mod the emission system.
If your catch can is full what is the oil % that is the big number. Gas in the PVC gets reburned no issue for the engine.
In high climate areas the nature of the metal catch can will collect condensation. Without it condensation would be burned in the engine which is no big deal either. So just because there is gas in the catch can over a long period of time does not mean it prevented any sludge from going in the engine. Unless you can derive the exact oil content its impossible to know the value.
Also if it was a lot of oil in the PVC then these engines would be running low on oil every month.
Also what is the impact towards warranty and altering the emission systems. Some states its illegal to mod the emission system.