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The oil fill pipe runs from the trunk to the top of the engine. It is plastic and gets brittle with age. Further, the end at the trunk is fixed but the end at the engine moves with the engine, so the pipe gets worked mechanically on a constant basis. If it cracks you will get oil on the engine when you fill, or during high g cornering. Further, if it is cracked and is drawing in air, it will affect vacuum and Maf readings. Note that another mechanism that will crack this pipe is a failing aos that adds excessive vacuum to the crankcase; the vacuum can try to collapse the fill pipe and cause it to fail.
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Hybrid Mode
