I thought the CCV is basically just a large oil separating trap. So adding another one in line is sort of putting a filter after the filter. I've never seen inside of one. If it's made of mesh you'd think you could wash it in solvent. I guess it's not worth the trouble if you only need to do it every 50-60k.

If they calibrated it JUST right they could get the oil lost through the blowby to exactly match the oil increase through fuel dilution, lol.