Knowing that this engine 2.4 has a reputation of clogged or freezing up pcv system and blowing rear main seal. C FM makes a breather with a check valve to relieve crankcase pressure. Finding oil (ounce or two) in filter box and corrugated tube to intake box starting to worry about this problem.
https://www.c-f-m.com/performancepa...quinox-GMC-Terrain-2-4L-Ecotec-p6443.htm
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