Bosch Spark Plug W225Z3M

The Bosch W225Z3M is a discontinued spark plug that is no longer manufactured. Where a current equivalent exists it is shown in the alternatives below.Bosch heat value 225 (higher number = colder plug on the Bosch scale). Approximate NGK equivalent heat range: 7.Heat (NGK scale) is our conversion of the Bosch heat number onto the NGK scale, so plugs from different makers can be compared on one hot-to-cold ladder. Makers' cross-references can be half a heat range apart, and plugs have moved up or down the scale over the years where no direct replacement exists, so treat it a