Question

Diesel exhaust fluid (DEF) is to Be added to a new model diesel vehicle. The cap on the DEF reservoir/Bottle is normally:

A) Blue.
B) green.
C) white.
D) yellow.

Answer 1

The cap on the DEF reservoir/bottle for a new model diesel vehicle is typically blue, which helps in avoiding confusion with other vehicle fluids and ensures the proper maintenance of the vehicle's emission control system.

Step-by-step explanation:

The cap on the DEF reservoir/bottle is normally blue. Diesel exhaust fluid (DEF) is a key component of the Selective Catalytic Reduction (SCR) process used in diesel vehicles to reduce emissions. The DEF cap is color-coded to prevent mixing fluids and to ensure that only DEF is added to the DEF tank. It's important to note that you should never add DEF to the diesel fuel tank or vice versa, as this can cause significant damage to the vehicle.

DEF itself is a clear liquid that is comprised of 32.5% urea and 67.5% deionized water, and it is used to break down dangerous NOx emissions into harmless nitrogen and water vapor. The distinctive blue cap helps service personnel and vehicle operators identify the correct tank for DEF.