Go to a motorcycle shop that specializes in off-road bikes, you can get a litre of foam filter oil for about £10.
Also most motocross guys just wash the filters in petrol (test a small area of the element first to make sure it doesn't attack the foam/glue and wear gloves) and let it evaporate before re-oiling.
The easiest way to re-oil air filters is to stick them inside a plastic bag with the oil and just squidge it about, as the archdeacon said to the ladies rugby team
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