The common cause for oil being in the engine's air filter is the positive crankcase ventilation (PCV) valve. If too much ...

The job of the Positive Crankcase Ventilation (PCV) system is to remove blow-by gases from the crankcase by vacuum and recirculate them via the intake manifold to be burned in the engine.

Crankcase blow-by is hot gases that sneak past the piston rings. As of 2007, the U.S. Environmental Protection Agency limits nonmethane hydrocarbons to 0.14 grams per bhp-hr. Blow-by gases are ...

Vahid Golkarfard, Ramanathan Subramaniam, Jonathan Broughton, Andrew King, Benjamin Mullins, Comparative Performance of 12 Crankcase Oil Mist Separators, SAE International Journal of Engines, Vol. 12, ...

The positive crankcase ventilation valve releases exhaust gas and unburned fuel from the engine block into the intake manifold. All engines allow some exhaust gases, unburned fuel and oil to ...

A significant part of these on-road emissions used to come from the crankcase — up to 30%, according to a 1962 study — but thanks to changes in engine design, that's no longer true.

The heater for the positive crankcase ventilation (PCV) valve may short circuit. View full recall details at NHTSA.gov. Millions of swimming pools recalled following the deaths of 9 children.