Re: waste MOTOR oil as fuel??
i read this post BEFORE i saw you had a new bus.
i think a centrifuge would be an awesome method for filtering used motor oil. Also, i bet that DD will burn just about anything you put in it....and it doesn't have a single injector pump, rather each injector is it's own pump which means that if things do go bad, you can at least still get home even if one or more cylinders stop producing power.
Quis custodiet ipsos custodes (who will watch the watchmen?)