Let’s be honest: buying fuel additives often feels like buying snake oil. There are 27 different bottles on the shelf, they all promise to “clean your engine” and “boost performance,” and they all smell like chemically-scented paint thinner.

Does any of it actually work?

At Shordee Generators, we don’t like guessing games—especially when your backup power is on the line. A generator isn’t like a truck that burns through a tank of fuel every week. Your generator might sit idle for months, waiting for a blizzard or a power outage. If that fuel goes bad, the engine doesn’t start.

We decided to stop reading the labels and start testing the chemistry. We ran a head-to-head bench test between a popular retail-grade additive and XP3, the industrial-grade formula we trust in our shop.

The results were… messy. Here is what we found.

If an additive claims to clean carbon deposits out of your injectors, it should be pretty potent, right?

The Experiment: We took a standard soda can. The ink on the bottom of those cans is carbon-based—chemically similar to the soot that builds up in your diesel engine. We applied a retail additive to one can and XP3 to another.

• The Retail Stuff: It sat there. It didn’t smudge the ink. On a cleaning scale of 1 to 10, it was a generous 2. If it can’t remove ink from a can, it’s not going to remove baked-on carbon from your fuel injectors.
• The XP3: It immediately attacked the carbon. Without even scrubbing, the ink started to dissolve and break down.

Why this matters to you: Clean injectors mean your generator starts faster and handles a load better. If the additive isn’t actively breaking down carbon (like the XP3 did), you’re just pouring money into your tank.

Modern Tier 4 generators are incredibly sensitive to emissions. They have Diesel Particulate Filters (DPF) that trap soot.

The Experiment: We set a small amount of both additives on fire to see how they burn.

• The Retail Stuff: It burned with a dark orange flame and puffed out visible smoke.
• The XP3: It burned with a clean, nearly invisible flame.

Why this matters to you: If your additive creates smoke, it is clogging your DPF filter faster. That forces your generator to run “regen cycles” more often, burning more fuel and using more DEF fluid. You want an additive that burns clean, not one that adds to the pollution.

This is the big one for Saskatchewan. Modern bio-fuels are hygroscopic, meaning they suck moisture right out of the air. Since your generator sits still for long periods, that water separates and sinks to the bottom of the tank, exactly where the fuel pickup line is.

The Experiment: We mixed water into the additives in a test tube.

• The Retail Stuff: The water separated instantly and sank to the bottom. It did nothing to stop the separation.
• The XP3: The mixture went hazy for a second, then turned clear. The XP3 chemically bonded with the water, keeping it suspended in the fuel.

Why this matters to you: If you have free-standing water in your tank, you get rust and microbial growth (algae). By keeping the water dispersed, XP3 allows it to pass harmlessly through the engine during combustion, preventing tank rot and engine failure and costly repairs

Diesel fuel isn’t just for burning; it’s also a lubricant. It keeps your fuel pump and injectors from grinding themselves to death.

The Experiment: We looked at the residue left behind after the additives burned out.

• The Retail Stuff: It left a dark, sticky sludge. It felt like molasses. The test can literally stuck to our fingers.
• The XP3: It left a clean, yellow oil. When we rubbed it between our fingers, it was smooth and slippery—exactly like a lubricant should be.

Why this matters to you: Sticky residue creates friction. Friction kills injectors. You want your additive to leave a protective film, not a sticky mess.

Here is a little industry secret: If you pull the MSDS (Material Safety Data Sheet) for many store-bought additives, you’ll see the main ingredients are often “middle-distillate fuel” or “naphtha.”

Translation? You are paying a premium price for what is essentially filler fuel.

XP3 is an industrial concentrate. It’s what commercial fleets and heavy industries have used for 35 years because it is 100% active ingredient. It stabilizes the fuel, disperses the water, and cleans the carbon.

At Shordee Generators, we don’t just sell this stuff—we use it. We want to make sure that when you flip that transfer switch, the lights actually come on.