Tried to add this to an existing thread, but wasn't very successful for some strange reason. Anyway, this is about air filter oils.
Just wanted to say that I have found, at least with motorcross/enduro bikes which are subjected to a lot more dust, that the best oil for foam air filters is simply air filter oil, normally available from dealers. As opposed to two-stroke or gearbox oils, it is specially formulated, extra tacky, penetrates well through the filter and doesn't restrict airflow.
That said, my motorcycle maintenance improved greatly since I discovered BIODEGRADABLE air filter oil, such as Notoil oil (No Toil Biodegradable Filter Oil



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