Spectre are oiled like K&N, if you look on the plastic it came in, it says "Pre-Oiled and Ready for Use"... maybe Spectre makes a dryflow line, but I know the ones that are on the shelf in Autozone and Advance are oiled.
Those filters use oil because their filtration media is too loose and widely spaced to filter anything, the spaces between the fibers are relatively huge... they need the oil to trap the dust and dirt and whatnot. The oil holds onto it until you wash it and recharge it with clean oil.
Dryflow filters are made of a synthetic media that have very very small spaces between the fibers so they can trap microscopic dust and dirt without the need for oil. Just swish em around in soapy water for a few minutes, rinse it and let it out to dry.