New K&N Air Filter - Nice Surprise

[got3fords]

There’s some bad information floating around about K&N filters and the old MAF-sensor oiling myths, but that doesn’t apply to the Ranger at all. If someone wants maximum filtration efficiency, they should stick to a standard paper filter like Fram or the OEM Motorcraft—those filter far better than any “high-flow” filter, and they actually get more efficient as they get dirtier. High-flow filters like K&N trade a very small amount of filtration (we’re talking fractions of a percent, around 0.05–0.10%) for higher CFM, and again, they filter even better once some dust loads into the media. The oil question is irrelevant here because the first sensor after the filter isn’t a MAF—it’s just an intake temperature sensor. Even if trace oil did pass through, the system already pulls oil mist into the intake tract through the PCV system long before the turbo, and then again through the second PCV line feeding the intake manifold. The only actual airflow-related sensors are the MAP sensors: one after the intercooler and one inside the manifold. So, the idea that an oiled filter can damage a nonexistent MAF is simply outdated information that doesn’t apply to this platform at all.

Great info. The reason I stopped using the K&N was the first time I went to clean and re-oil it, I gave a gentle tap on the work bench and a bunch of droplets of oil came off. Granted I didn't let it sit and soak it, but I was concerned what would happen if the oil droplets made their way to the high speed spinning turbo inlet blades. And also if it would contribute to increased intake valve deposits.

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