Fuel additives are some of the most criticized products you’ll see at an auto parts store. Most people feel that fuel and oil additives are a lot of snake oil, and honestly it’s understandable. Without being able to see what they do, and without real test results, normal people are skeptical and when you see the claims that many of these make it’s no wonder. The more outrageous the claims, the harder it is to believe, but then it also makes people skeptical of all of them. So what kind of scientific testing do you need to either think they aren’t worth having, or to decide they do something good?
Check out the video below from the Motor Oil Geek to see why he says dieself fuel additives aren’t all they are cracked up to be.
Video Description:
Thanks to the help of Andrew @RepairGeek , we tested 7 more popular diesel fuel additives: 2 Cycle Oil, ATF, Marvel Mystery Oil, Howe’s, Amsoil 4-in-1, Lucas Cetane Booster and Motorcraft.
Let’s find out if they actually work—or if you’re wasting your money. We ran controlled lab testing on: Lubricity (ASTM D6079) Cetane number (ASTM D613) Fuel cleanliness (ISO particle count) Then we added a surprise candidate – Premium Diesel Fuel. Let’s see the results! All of these products improved the lubricity of the fuel, but not all of them increased the cetane of the diesel fuel. Some brought along unwanted tradeoffs for that performance enhancement. In the end, the results made it clear that not all diesel fuel additives are created equal.
Some work better than others, and there’s actually a better alternative. We’ve previously covered 6 other diesel fuel additives, so here’s the link to that video ( 
• EXPOSED: The TRUTH About Diesel Additives ).
Let’s get into the science behind these diesel fuel additives. To learn more about the new TopTier fuel specs, check out this link: https://www.toptiergas.com/wp-content… To learn more about used oil analysis, check out https://www.speediagnostix.com For a deeper dive into the science of lubrication, check out my good friend Rafe Britton’s channel @LubricationExplained
