Hi,
Your PCV may be clogged, but the chance are the you have blow by. This is crankcase pressure making it into the head, meaning that you have issues with your piston rings. the rings are either broken or gummed up.
If your PCV is clean, run SeaFoam or an equivalent product. If this doesn't work, it's broken rings.
What color smoke? Possibly burning coolant. Check for bad head gasket. Possibly engine running rich, which could be for a number of reasons, vacuum leak/pcv valve/clogged breather tube or chamber/ bad o2 sensor(s)/off timing/weak spark or bad spark plug/leaking injectors/clogged air filter/thermostat (if car running cold)/MAP or MAF sensor/etc.
Could be valve guides and seals clean crankcase breather .poss. backpresure
it could b valve seals, head gasket, blocked oil galleries, piston rings, cylinder bore. oil drain holes from the cylinder heads to the oil pan get clogged and oil puddles and gets pulled down the shaft of the intake valve and burnt with the air/fuel charge causing blue smoke. pcv valve(positive crankcase ventalation), if clogged causes a vaccuum during intake stroke . damaginging seals and gaskets and a rebuilt engine probably has a few of these. does it smoke real bad after being run and then sitting 4 a short time?
If White smoke with oil come out from DDC running Engine Breather out let, it symptoms of Piston Ring set wear out and injector has to be calibrated,
Blue smoke coming from a lawn mower could be caused by burning oil, a clogged air filter, or a problem with the engine's piston rings.
A bad or clogged stack relay i have found bad oil will cause the stack relay to clogged
Valve cover gasket.
built up heat coming out engine breather tubes on the motor!
pcv system is clogged up.
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yes burning oil smokes if the exhaust is clogged the motor will not run so if you suspect a lot of oil in the exhaust the engine needs serviced
smog