Those filters are not real suitable for the 3ltrs apparently. Some have said they oil up the MAF. But having said that I am keen to try one myself. If I stuff a maf, I have another 30 sitting here on my shelf... :)
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That is true that people oil their MAF. BECAUSE they do not follow the cleaning instuctions properly. It take 20min to clean a very dirty filter, a couple of hours to dry. 10 min to oil and another few hours for the oil to soak in and the excess to run off cleaning the excess off with a rag.
Also Mark the OEM and Ryco filters are oiled but you only need to lightly oil the KnN.