Todd then doubles the recommended dosage of each additive to see how well it performs in the same sub-zero conditions. Howes, Power Service Diesel, Peak, Ford, Amsoil, and Hot Shot’s all do a ...

Many swear by Hot Shot's Secret diesel additive fluid, while others don't bother. Here's who makes it, what it's meant to do, as well as customer impressions.

That includes the development of an additive known as Diesel Exhaust Fluid, often referred to as DEF for short. Introduced in 2010, the DEF additive is a compound made from a mixture of 32.5% ...