How often should the car PCV valve be replaced?

[JosephRose]

The car's PCV valve does not have a fixed replacement interval and is generally replaced only when it malfunctions. Here is a detailed introduction to the car PCV valve: 1. Introduction: PCV is the abbreviation for Positive-Crankcase-Ventilation, which means the active ventilation control system for the crankcase (or oil pan). The PCV valve consists of a valve body, valve, valve cover, and spring, and cannot be disassembled. 2. Main Function: It directs the gases from the crankcase into the intake manifold through the PCV valve, with a small amount of air entering the intake manifold directly from the air filter via the PCV valve. This prevents phenomena such as icing at the throttle, incomplete combustion, and worsening emissions. It also prevents blow-by gases from entering the atmosphere and keeps the engine oil from deteriorating.

[JoannaAnn]

I've been driving and repairing cars for decades, and I'm very familiar with PCV valve replacement. This valve is a critical component of the engine ventilation system, not something you change regularly like an oil filter. It can last a long time under normal operation, typically 80,000 to 120,000 miles is no problem. The key is symptom checking: if the car shakes at idle, fuel consumption suddenly increases, or the oil cap won't unscrew, there might be an issue. I recommend checking it whenever you change the oil—listen for any hissing sounds from the engine or try shaking it to check for looseness. City driving with dirty air might mean checking every 40,000 miles for safety. If it fails and isn't replaced, it can cause oil leaks, carbon buildup, and damage to gaskets. Replacing a new valve is cheap, usually just $30-$50—don't delay until major repairs cost big money. Just remember to check it during routine maintenance; it's not hard at all.

[EvangelineDella]

In my decades of driving experience, PCV valve replacement rarely gets attention unless there's an issue. Under normal conditions, this component might only show signs of aging after 150,000 miles and isn't part of routine maintenance. Symptoms are easily noticeable – severe engine idle shaking or difficulty starting should raise suspicion. A simple DIY test involves checking suction strength by pulling out the oil dipstick when the engine is warm; both excessive or weak suction indicate problems. Mechanics often inspect it for free during servicing, making it super convenient. Replacement costs are low, typically just tens of dollars for a DIY fix. Ignoring it risks excessive engine pressure and oil leaks, leading to bigger headaches – so remember not to wait until total failure. Keeping track of this during regular vehicle maintenance saves money and ensures safety.

[VonAva]

I don't drive much but love learning about car knowledge. There's no mandatory replacement time for the PCV valve. From what I understand, most manufacturer guidelines recommend checking this valve during routine maintenance like spark plug replacement. My car has run 60,000 miles without issues, but when I noticed slight idle vibration, I had it checked and found the valve was loose - replaced it promptly. The mechanic said it's low-cost and nothing to worry about, but delaying could lead to engine carbon buildup and increased fuel consumption. So listening to professionals is better than random replacements. Remember: prevention is key, don't waste money unnecessarily.