The Oregon thing is "safety" related. If you have a Diesel engine, you can pump your own fuel. Gasoline is flammable, but diesel is only combustible (definition relates to flash point of the fuel - gasoline is minus 45F, and diesel is around 140F.) Now you don''t have to worry about an attendant mistakenly dumping a quart of motor oil into your power steering reservoir (that happened to me once.)
