I always fill the FL-1995 filter when Replace it.
Proper way would be to pour the oil into the outer holes,
Which would take for ever.
When I fill it through the center big hole, Iam dumping it
in from a clean factory filled container. But I suppose any
contamination that could drop into the big hole can`t be
ruled out.
The Filter when you open the box, is not wrapped in anything. just an open Filter, and dust/dirt through all the
shipping and handling could have entered it...who knows?
Same with the Fuel Filter, fuel comes out the big center hole and then to the IP. Any contamination here is more critical.
So yeah, I fill the filter the same way, but fill it with ATF or MM oil from a clean bottle.
Which ever way it has been done buy us or prior owners, the engines still run 300 - 500K miles.
Blowing out Air Filters can be bad, too much air pressure and holes can be blown through the paper. Also dust blowing around "can" float around to the inside of it if not careful.
The filter I use (Wix?) has the foam outer pre filter cover.
I pull it off and replace with a spare clean one. Then wash out the removed one. amazing how much it collects and keeps the paper one clean much longer. I have used low air to blow through them just to see if anything comes out and usually nothing the eye can see.
And here is the area of Nevada we are in is dusty, and we are on a dirt road.
Kind of like fore play, stick it in, s-crew it down and fill it up and move on.
Goat