Oiled_Blocks_1.5.1.zip is a release file of the Minecraft resource pack Oiled Blocks [64x], made for Minecraft 1.5.1. It was published on May 4, 2013 and is 7.6 MB in size. For the full description, screenshots and every other version, visit the Oiled Blocks [64x] resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.