V12 Engine

Each bank works like an inline six, which is already well balanced. V12s are used mainly in luxury and high-performance cars. They are long, heavy and expensive to maintain. V12 engines are now rare as emission rules push makers towards smaller engines and electrification.

Twelve overlapping power strokes give very smooth delivery, and opposing forces cancel each other out.

Maintenance such as spark plugs and ignition parts costs more because there are many of them. A full service history matters greatly when buying a used V12.