![]() In most cases, resolving this issue simply requires replacing the PCV valve. Rather than remove combustion gases, oil ends up getting sucked into the engine through the air intake. However, when the PCV system gets clogged, it can cause significant oil blowback. It does this by routing excess gases back to the combustion chamber, where they are burned a second time before exiting with the exhaust. The positive crankcase ventilation (PCV) system is a vital engine component that eliminates harmful gases generated during engine combustion. ![]() Here are a few of the common causes of excessive oil consumption: Worn Out PCV Valve For newer engines that use low-viscosity oil, such as 5W-20, even small amounts of wear can lead to oil entering this chamber. When oil seeps into the combustion chamber, it’s usually due to one or more worn parts. However, vehicles with fewer than 50,000 miles should typically use no more than a quart of extra oil between changes. Losing too much oil can lead to serious engine damage and expensive repairs, especially among older cars with 100,000 miles or more on the odometer. While it’s normal for some cars to burn more oil than others, it’s best to have your vehicle serviced as soon as possible if you experience consistently low levels. Blue-tinted smoke coming from your exhaust is a potential indicator of this issue but may not always be evident if your engine only burns small amounts. Oil burning happens when faulty engine parts allow oil to seep into the combustion chamber. Low Oil But No Leak? You’re Probably Burning Oil But if you have to add a quart or more of oil to your engine between changes and there’s no leak to be found, chances are your vehicle's burning oil. Though you may not see any visible signs of leakage, less noticeable parts like a worn seal or leaky rings may be the culprit.įortunately, during a full-service oil change, Firestone Complete Auto Care offers a free 19-point inspection to find any visible leaks. When a car mysteriously loses oil, there are usually two possible causes: either you’ve sprung a leak, or your engine is burning it away. Keep reading to learn why your car is losing oil but not leaking and what you can do to fix it. If you don’t see any visible signs of a leak, the issue may be something else entirely. You’re driving down the road, and suddenly your oil light comes on - again! There's no puddle beneath your car, and you know it isn't time for another oil change.
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