I've used both K&N, JR and Green service kits on DNA filters and all seem to work equally as well as the DNA stuff. Just depends what I have around at the time as my V8 Land Rover runs JR filters and the BSA a K&N. Generally the DNA service kit (cleaner and oil) is the most expensive option, with K&N the cheapest (�9 and free delivery on ebay). Green and JR come somewhere in between. It also depends on what colour you want your filter! K&N and DNA are red, JR is blue and Green is, erm... green!

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