i've seen this before. the valve cover that has the pcv valve gets oil trapped in the baffles and pulls oil through the pcv valve and will cause high oil consumption. 1qt. every 1000 miles is about the amount i have seen with this problem every time. just replacing the pcv valve will not fix it. the valve cover will have to be replaced. i've seen this on all the 3.5 engines.
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Andre Dalrymple
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