I have done BMCs in all my Maseratis. Pretty easy job in the Ghibli and Levante.
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I see, Thank you very muchOil is added to aid the filtration. Without the oil, the cotton gauze layers are too porous to offer reasonable filtration. The OE paper filter elements are relatively more restrictive but offer better filtration. While the BMC/K&N filters can be washed, oiled and reused, the OE filters can only be replaced.
What air pressure are you using on your compressor when blowing the "extra/residual" oil from the filter after re-applying the oil?the oil is part of filtration process used by these "high performance" filters like K&N. Certain amount of oil is must or the filter isn't going to filter sufficiently for the smaller particles. After wash, I'd saturate the filter and let it sit overnight, then use compressed air to blow off excess. I've not had issue with oil on MAF all these years.