Is it worth it to Clean the CCV valve?

[JCL]

Originally Posted by FCBuff

I disagree. If CCV is working, there should not be any Mayo under the fill cap. I had the mayo until I replaced the CCV, now nothing, and no oil consumption either!

It is the other way around. The condensate paste is formed over time from the engine not getting hot enough, and being kept hot long enough, to burn off the moisture that is in the engine. The moisture emulsifies with the oil, forms the paste, and if it is collecting under the filler cap (easy to see it there) it will also collect elsewhere. If it collects in the CCV, and it gets cold enough, it can freeze.

The CCV doesn't cause the paste, it is a victim of the paste freezing. The CCV can work perfectly and the paste still collect. If it doesn, the fault is the driver's, for abusing the vehicle with too many short trips and never giving it a good hot run.

You are correct that there shouldn't be any paste under the filler cap. It should never form, because the moisture should be burned off first. Once it has formed, it doesn't easily burn off.