Yep, thought about that also... I think Perma-cool makes an adapter also. There is another company I found that makes the adapters, but didn't write it down... kinda pricey though.

Also found a site that sells an onboard "refining" system that seems to be aimed to the OTR guys. It's basically a bypass filter system, with a fine filter in one can, and the other can is a gadget that removes water, fuel, anti-freeze, etc. It's got a heating element in it, and an atmospheric vent for the gas-ified impurities it removes. Way pricey for us though, starting at $450, add a few accesories, hoses, etc, and you'll be up around $700 in no time. Just not worth it... I could buy a lifetime supply of 10-30 and change every 2000 miles, and still have enough for the family to "pickle" me in a 55 gal drum when I kick the bucket. I lost that URL too, but I think a google on "oil purification system" should find it for the curious.