Thanks for the tip. I looked it up on the Oregon government website and there it is :Diesel is generally exempted from the self serve law. You can fill your own diesel truck (and gasoline motorcycle) - anyone telling you otherwise is out of date.
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"(2) "Class 1 Flammable Liquid" means any liquid with a flash point below 25 degrees Fahrenheit, closed cup tester. Note: Diesel fuel is not a Class 1 flammable liquid. "
(Oregon Secretary of State Administrative Rules)
I think I'm going to print this out and carry it in my truck