Your Diesel
Doesn’t Lose Power
For No Reason
If your truck is feeling sluggish, burning more fuel, or regening more often – this is almost always why.
A diesel engine needs three things to run right: oxygen, heat, and fuel. Air supplies the oxygen. Compression supplies the heat. So if your air filter is clean, your batteries are strong, and your starter is good – those usually aren’t the problem.
Most of the time, the issue comes back to fuel: whether it’s getting there, what condition it’s in, and how it’s being delivered into the combustion chamber.
That’s where dirty injectors quietly start costing you money.
Sound familiar?
Most drivers don’t notice it right away. The truck slowly feels weaker, burns more fuel, and regens more often. Tap any symptom you’re seeing:
Common warning signs
Tap each one that applies to your truck.
- Loss of power or sluggish throttle response
- Lower MPG than the truck used to get
- Rough idle or hesitation
- Excess smoke or soot from the tailpipe
- More frequent DPF regens
- Hard starts, especially when cold
Dirty injectors throw off combustion. Combustion is everything.
Diesel fuel has to be atomized into a fine mist for efficient combustion. The smaller the fuel particles, the more complete the burn.
Over time, carbon, varnish, and deposits build up on injector tips and inside the injectors, restricting flow and throwing off the spray pattern.
When the spray pattern is off, combustion suffers. Instead of a fine mist, the engine gets larger droplets or a poor stream of fuel. That means less power, worse performance, more soot, and more fuel burned just to get down the road.
What’s actually happening at the injector tip
A clean injector atomizes fuel into a fine, even cone. A dirty one doesn’t.
Splattered, uneven, oversized droplets – incomplete burn.
Fine, even cone of atomized fuel – complete combustion.
So why does it happen? Most diesel sold at the pump contains little to no detergents. Once deposits start forming, injectors stop performing the way they should. That creates incomplete combustion, which creates more soot and more deposits.
The problem feeds itself.
My F-350 6.7 has 260,000 miles. Added AR6400-D and my average MPG went from 10 to 12 when towing my 5th wheel. Going to definitely add every 5,000 miles or every oil change.
This is what
your dirty
injector
looks like
Why dirty injectors get expensive, fast.
Once injector problems are diagnosed, replacement is often the recommended fix – and the cost adds up fast. On most modern diesels, individual injectors run $300 to $700 each, before labor.
See what a full replacement would cost on your engine:
Cost-of-replacement calculator
Pick your engine to see the damage.
Parts only. Labor is on top.
But injectors often lose efficiency long before they completely fail. If you’re noticing hard starts, power loss, smoke, or frequent regens, you may not need new injectors yet. They may simply need deposits removed – before permanent wear causes failure or other engine problems.
Maintenance isn’t restoration.
A lot of diesel additives are made for maintenance. That’s fine if your fuel system is already clean.
But when deposits have been building for thousands of miles, a light additive isn’t strong enough. You need a cleaner built to restore the fuel system, not just maintain it.
When injectors spray correctly again, the engine runs smoother, responds quicker, and burns fuel more efficiently – the way it was designed to.
I thought it was going to be “snake oil” but the proof is undeniable. Truck idles, accelerates and generally runs better. Have repurchased more.
That’s where AR6400-D comes in.
Archoil AR6400-D is a high-performance, commercial-grade diesel fuel system cleaner designed to rapidly clean injector tips and remove internal injector deposits within one full tank. By restoring proper fuel atomization, it helps the engine burn fuel cleaner and more efficiently.
What AR6400-D does:
- Removes injector tip and internal injector deposits
- Restores spray patterns and fuel atomization
- Improves combustion efficiency
- Reduces soot and deposit buildup
- Supports smoother starts and throttle response
- Helps reduce excessive regens
- Cleans the full fuel system – not just the injectors
AR6400-D works well cleaning the soot from my 6.7 Cummins. Regens extended to over 1,000 mile intervals. Will continue to use every 5K miles. A MUST product for diesel engines new and old.
Use AR6400-D for the corrective clean-up, then AR6500 Diesel Treatment for ongoing maintenance at every fill-up. Together they keep your fuel system performing the way the factory designed it.
