Hi Scott can you help me with 3.7 cx9 mazda i found oil in air filter from breather hose is pouring and it's on synthetic 5w20 castrol a frend don't have that problem with a 3.5 engine duratec ford engine witch is olmost the same he got twice more miles on vehicle but no sign of oil using conventional oil should i change oil ?
Well first check the PCV valve if it's stuck you can get that but other than that if you do get oil in there it generally means your engine is starting to wear out and piston rings are worn a mechanic can do a wet and dry compression test to see what the problem is
Is it possible that pcv valve that is located in rear of that engine and is connected to air intake on the other side is passing oil where air filter is becouse i found verry hard to see hows that possible? I see like it's breather hose is wet and that issue is on that side can i be mistaken?