The short answer is, “NO.”

 

Oil and fuel additives don’t automatically void Warranties but for a manufacturer to make a blanket statement that the use of a fuel additive automatically voids the cars warranty, is strictly false.

 

Many of the diesel engine manufacturers offer their own proprietary diesel fuel additives under their own name and brand. It is also true that many different fuel additive products (i.e. cetane improvers, lubricity agents, conductivity improvers, pour point depressants, CFPP reducers, etc.) are routinely incorporated to some extent into finished fuels by the petroleum refiners and terminal distribution points before sale to fuel consumers.

 

The US Government recognized the “restraint of trade” situation being created by the engine manufacturers against fuel additive suppliers and in 1975 passed the Magnuson-Moss Act.

 

This legislation (among other things) makes it illegal for any equipment manufacturer to void a warranty because an equipment buyer uses a fuel additive.