Powertrain - Overview: Overview BMW 3 series E46 facelift

Engine Designations And Identification

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

Scheme 59

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

Scheme 60

1. "AF" in the engine code refers to the upper output stage or "OL"
2. "AE" in the engine code refers to the lower output stage "UL".