The marking of BMW engines consists of a set of numbers and letters that represent information about the technical specification of the engine. At first glance, it may seem that there is no logic in this set, and the numbers are random. However, this is not the case and it is similar to the vehicle marking system – the VIN Number (Vehicle Identification Number) is the way by which manufacturers mark which version the car belongs to.

There are several reasons why you want to ventilate out these so-called blow-by gases: