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A few simple answers here... That oil is from the crankcase vent tube that comes in at the bottom of the box. It helps crankcase fumes to vent and get burned in the engine to reduce emissions. Several things cause the oil to come in. 1. too much oil in the engine/crankcase... (very common). 2. a plugged pcv (pos. crankcase ventilation) valve. normally located on the top of the engine on the valve cover. 3. high mile engines get some "blow by" thru the rings of the cylinders. this excessive compression gas gets into the crankcase at the bottom, then has to push out thru the vent tube at the top and takes some oil with it. Make sure your crankcase venting system is clear and clean. A plugged system can cause pressure buildup and it has to push out somewhere. eventually you can blow engine mainseals at both the front but mainly the back between the engine and tranny. An expensive repair bill there...

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Q: Why is there oil in air box on Mercury Tracer?
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