i posted this on a catch can thread in the v6 forum, but really my research applies specifically to the lsx motors, though i think the gist is the same for any engine. anyway, this is worth a read. take note of the c4c5 poster's title: "gm world class certified technician." there are two other mechanics on the post that agree the catch can is a waste of time and money.
http://corvettemechanic.com/forum/3841-catch-can.html
Quote:
Catch cans were invented because of someone wanting to make money, its that simple.
PCV systems are ALWAYS not enough at high rpm usage. This is why this occurs. The higher the engine revs, the more pressure occurs in the crankcase, which the valve will not ventilate. So, the residual oil vapor comes up through the fresh air hose to the intake.
Someone just thought it would be a great idea to make a dollar off it.
I would like SOMEONE to show me ONE ENGINE/CAR MANUFACTURER THAT MAKES ONE. This is because there is no need.
The fact that your running synthetic oil, only allows the condensed oil that is there to run into your engine.
And you burn it.
There is no harm to your intake manifold, throttle body or engine as this occurs.
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key note is that you burn it. people see their catch can filled with oil, or even see it inside their intake and then freak out. but many don't realize as that gets sucked into your engine (that is operating at very high temperatures), the type of oil that is going into the engine via the intake is burned up immediately. the result...it sounds to me, is harmless to your engine. thoughts?