What should be done with any remaining diesel exhaust fluid (DEF) in the bottle after adjustment?

Storing the remaining diesel exhaust fluid (DEF) in the original container is the correct practice because these containers are specifically designed to maintain the integrity and quality of DEF. The original packaging helps protect the fluid from contamination and exposure to light, which can degrade its effectiveness.

Additionally, storing DEF in the original container allows for proper labeling, ensuring that anyone who later accesses the fluid understands its use and handling requirements. This practice also minimizes the risk of spills or environmental contamination that could occur if DEF were transferred to an unapproved container.

Other methods, such as discarding it in the trash, pouring it on the ground, or transferring it to a different container, might not only compromise the fluid's quality but could also lead to environmental concerns or safety issues, as DEF needs to be handled properly to avoid any adverse effects.