12/15/2023 0 Comments Cost to replace valve stemGM also states that normal consumption can be one quart every 2,000 miles. For example, BMW suggests that its engines may burn a quart of oil every thousand miles. To determine how much oil consumption is normal, it’s helpful to look at guidance from the car manufacturer. It’s not uncommon for some vehicles to use oil between changes. Either way, you want to change the spark plugs, but not before you fix the underlying issue. It could be coming from a leaking valve seal or a defective turbocharger.Īs it burns on the spark plug, it turns into a clay-like substance and it remains there. This problem indicates that oil made it through the combustion process and settled on the plugs. Oil On Spark Plugsĭuring a spark plug change, you might notice some oil on the tips. That’s why it’s important to run through some diagnostic steps listed below before concluding what may be the problem. This blue smoke can also be caused by worn piston rings or bad PCV (Positive Crankcase Ventilation) valves. While valve seals are a common cause of this problem, it’s not the only thing that may be wrong. It’s important to note that blue smoke simply means that the engine is burning oil. Over time, the blue smoke is going to get worse, especially while traveling at higher speeds. This problem forces oil through the exhaust pipe, where it turns into a cloud of blue smoke. An exhaust valve seal can also be leaking. Yet, after some time, you should start to see the bluish tint it has.Īs the intake valve seal leaks, the engine consumes and burns more oil in the combustion chamber. Some people mistake the blue smoke for a grey color at first. In fact, this is one symptom that can help determine if the valve seals are bad. Most commonly, blue smoke starts to come out of the exhaust pipe when a valve seal is bad. Let’s dive deeper into these six possible failing valve seal symptoms.
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