08/28/2026
Today, we are talking about your PCV valve. Unburnt fuel is forced into the crankcase as your engine runs. The PCV (positive crankcase ventilation) valve vents this unburnt fuel and oil vapors from the crankcase and sends it back into the air intake system to be burned in the engine. A clogged PCV will not allow these vapors to escape. This can dilute and contaminate the oil, leading to damaging engine oil sludge. It can also cause vehicle engine corrosion, something we see occasionally. At high speeds on freeways, the pressure can build up to the point that gaskets and seals start to leak.
Please ask your service advisor about your PCV valve. For the price of a couple of burger combo meals, you can avoid some very engine repairs.