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The Bosch YR8DII33X is a genuine Bosch spark plug.A Bosch iridium spark plug. The fine-wire iridium centre electrode needs less voltage to fire and resists erosion, keeping the gap stable over a long service life. Fit as the direct replacement where this Bosch part number is specified.Bosch heat value 8 (higher number = hotter plug on the Bosch scale). Approximate NGK equivalent heat range: 5.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 as a guide and check the recommendation for your vehicle.
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