Engine Designations And Identification

The N52 engine designation is similar to past engines and is broken down as follows:

Fig 1: Engine Designations And Identification Code

Courtesy of BMW OF NORTH AMERICA, INC.

The N52B30 engine in the U.S. will be available on the 330i as "OL" and on the 325i as "UL" versions. The "OL" designation refers to the upper output stage engine and the "UL" designation refers to the lower output stage engine.

The engine identification code is located on the side of the engine block, below the intake manifold directly between the knock sensors. The designation:

• "AF" in the engine code refers to the upper output stage or "OL"
• "AE" in the engine code refers to the lower output stage "UL".
  Fig 2: Locating Engine Identification Code

  Courtesy of BMW OF NORTH AMERICA, INC.