Yes. It is recommended to replace all of the engine’s glow plugs at the same time because if one glow plug is faulty, the probability is that the others are not too far behind. The replacement of all the engine’s glow plugs at the same time will reduce maintenance costs in the long term as well as vehicle down-time. It will also help to optimise vehicle performance as the driver can rest assured that all of the engine’s glow plugs are making the same contribution.