Remember though that it's actually not the liquid that burns, but the gas given off by it.
for some information, very interesting
Crude oil does burn. Motor Oil does not easily (with a match/lighter). It shouldn't or you would have to change your oil every 5 miles. Diesel and Jet fuel do not easily (with match/lighter). Gasoline does. Example on link I put above:
"Diesel has a Flash Point of [120 F], [gasoline] [-40 F]. If you throw a lit match into a bucket of diesel at room temperature you get a wet match but if you throw a lit match into a bucket of [gasoline] at room temperature you would get a major fire."
There are loads of oil pipelines through our area. The orange signs are crude oil or something barely refined that go from Louisiana to New York. Yellow signs (stringfellow road) are more refined, maybe gasoline. And then there's natrual gas all over the place.