What do engine manufacturers warranties cover?
Engine manufacturers warranties typically cover defects caused by “material and/or workmanship” for a limited amount of time. Fuel is not warranted under any condition. The use of products such as diesel fuel is at the discretion of the end-user. An engine manufacturer can refuse a warranty claim based on the use of a fuel that is not recommended for use. If fuel is thought to be the source of a problem it can be analyzed to be sure it falls within the ASTM D 975 standard. Again, other considerations may need to be taken into account such as the ambient temperature at which the engine will operate, elevation, etc. Also, local, state and federal regulations vary from one area of the country to the next. It is up to the end-user to use the proper fuel. Will adding RxP to my diesel fuel void my engine warranty? No. RxP is added to fuel at the rate of 780 parts per million (ppm) or .00078% of volume. RxP is made from hydrocarbons found in petroleum and does not change the molecular structu
