[mwebb]

Originally Posted by leg0man

If catch cans were pointless, cars wouldn't have a PCV system. Blow-by is expected, and catching it and disposing of it is better than running it through the motor, lowering the effective octane rating of your fuel and dirtying up your intake, throttle body, etc.

crankcase vapors are expected
crankcase vapors are inhaled to the intake then fed to combustion where they are burned , the volume of crankcase vapors relative to the amount of air fuel mixture
consumed by the engine is

less than insignificant

the function of the PCV / Crankcase vent valve is to capture those vapors and channel them to combustion so they do not escape to the atmosphere to pollute the atmosphere ,
PCV is good .

harmful deposits are more likely to be formed by using
low quality fuel and low quality engine oil .

which is one reason that
any engine oil that does not meet

ACEA A3 B3 -A3 B4 (best)
or
ACEA A1 B1- A5 B5 Dexos1 (close runner Up )
should never be used in any engine at any time

this is real synthetic engine oil , not to be confused with wanna bees like
ROYAL PURPLE and the other alleged synthectic oils which have no test specifications printed on the back of the bottle

read the back of your oil bottle to see
if it says only API SN ILSAC GF 5 ,with no ACEA test values ,
you should NOT use it and you should switch to the correct oil
ASAP
see BITOG forums for more info , study and learn .