I used a special air filter oil (Motul) on all my DR's and KLR's but it is very messy to apply and very difficult to wash out. Most manufacturers recommend to use the same oil you use in your engine and that's what I got back to and it works fine.
The filters are easy to clean with a very mild degreaser or even easier with ammonia household cleaner (here in SA sold as "Handy Andy"). After 2 - 3 washes the filter looks like new, dry and oil.
Never clean a KLR's filter with fuel as it kind of makes the filter soggy and lose its shape a bit and it will not fit properly after a few washes.
There is only one real reason to use air filter oil and that's water. Air filter oil does not emulsify as easily as engine oil, the water runs off like off a ducks back. Means this is the option for people playing a lot in rivers. - Living in Scotland and commuting I would not bother -
Talking about this good reason why (sometimes) to use special air filter oil also shows you the suppliers: Boat shops. It's commonly used for air filters of outboard engines and available from virtually every boat shop.
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