However, BMW engineers did create a prototype four-valve per cylinder V12, called the M72, which developed 265 kW (360 PS; 355 hp) and 530 N⋅m (391 lb⋅ft) of torque.

However, this 48-valve engine did not fulfill the comfort demands of the large sedan class in all respects and, as a result, did not go into production.

Similar to its predecessor, the M70, spark distributors are still present for each cylinder bank.

[5] Applications: Due to more stringent emissions standards, the 1999 model year marked the addition of an electronically heated catalyst,[8] variable MAP thermostat, and water cooled alternator.

Bore and stroke was increased to 85mm and 79mm and the total displacement of 5.4L was achieved, matching the values of the standard M73 engine.