Guy’s I’ve been riding for a long time and I always use the foam type filters because in my opinion they do the best job of cleaning the dirty air. I know there are many opinions on this so no arguing, it’s my opinion form 30 years of riding.
Any oil will be better than on oil on the filter, the main deference is that some, “not all” specific filter oils are better when the filter gets wet. I use Bel-Ray (foam filter oil) it is water proof oil with sling inhibitors in it that in my opinion is absolutely the best oil for foam filters. It also works well for chain oil as well.
Slightly Bent Racing # 47
400ex with some stuff
You shouldn't be concentrating on how fast your bike is.
You should be concentrating on how well you can ride it.
Never ride over your skill level and Never ride over the abilities of your machine.