3.5.1

• Added: Oil springs. (CovertJaguar)
• Changed: Several improvements to oil spawn. Oil lakes can now also spawn in other biomes. (CovertJaguar)
• Changed: Better API for pipe connections. (Krapht, Flow86)
• Changed: Moved block registration to FML. (CovertJaguar)
• Changed: Decreased packet size for pipe synch. (Krapht)
• Changed: Wrenches now also use Forge's rotation methods. (CovertJaguar)
• Changed: Proper blending when rendering liquids in tanks or pipes. (CovertJaguar)
• Changed: Several updates to fluid blocks. (CovertJaguar)
• Changed: Added synching of NBT data for items in pipes. (davboecki)
• Changed: Improved refinery render. (CovertJaguar)
• Changed: Renamed the hopper to chute. (CovertJaguar)
• Changed: Some minor optimizations to engines and their rendering. (CovertJaguar)
• Bugfix: Fixed redstone engine lockups. (CovertJaguar)
• Bugfix: Fixed gate rendering. (Krapht)
• Bugfix: Fixed NPE when destroying markers. (Prototik)
• Bugfix: Added correct particle textures for engines. (viliml)
• Bugfix: Include all metadata versions when generating facades. (Krapht)
• Bugfix: Fix pipe textures not being refreshed correctly when switching texture packs. (Krapht)
• Bugfix: Fixed several bad texture bindings in TESRs. (CovertJaguar)

• Bugfix: Iterate over all inventory slots and do not stop on first invalid slot when inserting via pipes. (Need4Speed402)

• API: IMC calls to ban oil from certain biomes or allow oil lakes in them. (CovertJaguar, h/t Aroma1997)