This is industry standard (there may be exceptions here and there) for V-type engine.

- When looking at engine crank pulley (front of engine):


V6
Bank 1---Bank 2
3---------6
2---------5
1---------4



V8
Bank 1---Bank 2
4---------8
3---------7
2---------6
1---------5

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT