Look in the yellow pages under oil / lubrication, you should be able to find a "jobber" that supplies oil to most of the quick shops and manufacturing plants around your area. My wife has a VW Jetta Diesel and that is where I get the Mobile Delvac 1 15-45 that it calls for. I Have to buy it by the case (4) gallons but this last me through three oil changes (takes 5 quarts per every 10,000 mile oil change).
That is what I will end up doing when I order more of the diesel oil is to see what they chage for the crossfire oil and get a case of it as well.