That too is also a concern of mine, but I've heard of people doing this with no ill effects. My OCC on the non-PCV side currently collects a very small amout of oil compared to the PCV side as well. This would also increase the vacuum signal for the non-PCV line, it is in a lower vacuum area from the factory as well as when hooked up to the CAI than what it will be going into the intake manifold. The stronger vacuum signal on this side should also increase the amount of oil being drawn out and collected in the OCC. I would probably get a larger OCC if I were to combine both lines into one OCC.

You can also hook them both up to the intake manifold using different ports instead of the same port. You can also run both lines into one OCC and then run it to two ports to possibly bring the vacuum signal strength back up. There are just so many different ways to run these OCC's that it can make your head spin.