Something is wrong if you need to change the PCV on a ka24de that often. I had a 1998 Altima SE that was auto crossed fairly frequently, and I never replaced the PCV in 176,000 miles. The car burned zero oil on 6k OCI with GC, even when raced. One of the club members had a 240sx with a turbo, and 130k miles on, he said he never touched the PCV valve. If the PCV is plugging up that fast, you have some serious blow by.
Running a negative crankcase pressure helps improve power by reducing crankcase pumping losses. As the pistons move down, they create pressure in the crankcase.
With the engine warm and at idle, remove the oil filler cap. If the idle drops slightly and there is a minimal amount of air coming out the cap hole, you have minimal blow by. If the idle stays the same and there is lots of air coming out, you have severe blow by. There are always vapors in the engine, it means there is nothing wrong. Piston rings never have a perfect 100% seal, there is always some gasses leaking past.
If you really have a plugged PCV every oil change, you some some serious mechanical issues, and catch cans, road tubes and the like will not really help much until the mechanical issue is corrected.
Running a negative crankcase pressure helps improve power by reducing crankcase pumping losses. As the pistons move down, they create pressure in the crankcase.
With the engine warm and at idle, remove the oil filler cap. If the idle drops slightly and there is a minimal amount of air coming out the cap hole, you have minimal blow by. If the idle stays the same and there is lots of air coming out, you have severe blow by. There are always vapors in the engine, it means there is nothing wrong. Piston rings never have a perfect 100% seal, there is always some gasses leaking past.
If you really have a plugged PCV every oil change, you some some serious mechanical issues, and catch cans, road tubes and the like will not really help much until the mechanical issue is corrected.