I was horrified a few years ago when I was researching biodiesel and kept running into these people called "blenders". These folks have access to large quantities of stuff like used lube oil, ATF or stale Jet-A and want to burn it in their trucks. Some of them want to run used cooking oil but don't want to go through the expense and hassle of installing a pre-heat system. To get their used whatever to flow and burn properly they mix it with small quantities of white gas, paint thinner, ATF, two cycle oil, benzene, xylene, mineral spirits, paint thinner, moth balls, and other nasty chemicals.
I figured this lot were a complete bunch of morons to risk their injectors with this stuff, even if they could afford to replace injectors every 24k with the money they saved on fuel. Then I started reading Material Safety Data Sheets for diesel performance additives (like Stanadyne mentioned above). What do I see? Naptha (white gas), mineral oil (ATF), benzene, xylene, Stoddard's Solvent (paint thinner), mineral spirits, and napthalene (moth balls).
So, yeah, all of this stuff will burn in a diesel. Small amounts of some of it might actually improve performance or clean out the system. The trick is knowing when you're adding too much and coking up your injectors or wearing out the injectors' hydraulic system because the fuel is too dry.
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