One Chem AdBlue additive is an essential fluid for diesel vehicles equipped with selective catalytic reduction systems. This 5 litre bottle makes it easy to top up your AdBlue tank between services. The easy-pour spout allows for mess-free filling and helps avoid spills. As the global standard for urea-based diesel exhaust fluid, One Chem AdBlue works to lower your vehicle's nitrogen oxide emissions and pass mandatory emission tests. This affordable additive extends the life of your diesel's emission system while helping the environment.