We don't mean to be the harbingers of doom, but it's unwise to keep driving if your car's engine has a malfunctioning positive crankcase ventilation (PCV) system, particularly a bad PCV valve.

The effects of PCV failure are especially noticeable in turbocharged engines, where crankcase ventilation becomes critical ...

Every engine has some sort of crankcase breathing system. The internal combustion process creates pressure, some of which makes its way past the piston rings-along with fuel vapors-and into the rest ...

Crankcase ventilation or breather systems are necessary components for all modern vehicles. However, they're especially important for diesels, and this is why.