Do you know what DEF fluid is? It's Diesel Exhaust Fluid. Every Diesel truck that has been made since 2010 is required to use it. It's made of 67% Urea fertilizer and 33% distilled water. Every diesel truck you see driving down the road today has to have this product to drive The engines won't start without it. There are regulators inside the engine that mix DEF with the Diesel to reduce Diesel emissions. That's the purpose of DEF.

Right now, Russia is the largest exporter of Urea by a wide margin. Qatar is second. Egypt and China are Tied for 3rd