oil pan 
noun North American
An engine sump.The engine exhales through a 21-liter muffler and twin 15-liter resonators, and uses a cast-aluminum oil pan and liquid-filled engine mounts to reduce NVH levels....
- It also has a deeper oil pan, a lighter and more compact water pump, accessory drives that are 37-mm closer to the block, and a redesigned exhaust manifold.
- Having seen what engine vibrations look like at the bottom of an oil pan, I had a hunch our once finely balanced turbine had serious problems.