Excellent Camo, thank you.It's all seat-of-pants dyno stuff, but some oils seem to be very sticky and stay tacky longer and others seem to be a bit more "wishful" in their use. I should have said "choice of oil, and a proper application" because a wool sock properly soaked in vegetable oil is probably more effective than a proper filter with a shite coating of even the best filter oil.
I've been using the Maxima FAB1 oil that comes bundled with filter cleaning spray (can also be bought on its own). It goes on a bluish color so you can see how evenly you have it applied. Seems to stay put also instead of pooling at the bottom of the filter. Bel-Ray has been good too.
Honestly a regular cleaning and proper application of any oil is going to make the biggest difference for any bike.