I asked that question once here........... And the silence was resounding! I finally was able to find MTM Industrial (oilguard) on the web. They don't have all the bells and whistles or hand holding that the "premium" services do, but they get the job done for me and if you order 3 kits over the phone they come out to about $12 each. I suppose if I give the number I will get reprimanded so you will have to look it up yourself. They are in Oceanside, CA. Good luck, RW