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That was just about the only thing I could think of close to where the filter box draws air from that could potentially be putting out oil
Thanks! My brother in law mentioned a coolant leak near the inlet but that looks clean too.
Originally Posted by Walleye Hunter
You don't have a CCV mod that drops your CCV into the filter box, do you? Is there oil in the box inlet?
Nope. I had the whole box out last year to make room for changing the CAC boots and I don't recall anything extra. The box appears to he dry and clean as well. Just the filter is dirty.
That paper is treated to catch the dirt and looks perfectly normal for a used air filter to me, I do not see this oil you are speaking of. Started working at gas stations at 15 back when they were service stations and have seen a lot of air filters in 46 years, that looks normal to me.
That's normal for a turbo charged engine, I bet the other side is clean as whistle. All that air being pulled by the turbo and engine sucks all the smog around you.
I've tested a lot of air filters for this application.
What you are seeing is normal.
The oil aerosol is from the CCV, which is redirected into the intake stream in a Pitot tube like device in the tap sleeve.
When the turbo isn't sucking (idle, low load, low speed tooling around), the oil aerosol is still puffed into the the intake tube, pushed by the back stroke of each piston.
That aerosol settles through the filter into a consistent pattern, as witnessed by the first photo I posted of two Motorcraft FA-1750's (manufactured by Wix) side by side.
You don't have a CCV mod that drops your CCV into the filter box, do you? Is there oil in the box inlet?
