SIX

The straight-six engine or inline-six engine is an internal combustion engine with the cylinders mounted in a straight line along the crankcase with all the pistons driving a common crankshaft.
The bank of cylinders may be oriented at any angle, and where the bank is inclined to the vertical, the engine is sometimes called a slant-six. The straight-six layout is the simplest engine layout that possesses both primary and secondary mechanical engine balance, resulting in much less vibration than engines with fewer cylinders.