Carbon buildup in your catalytic converter runs at 1,600°F. It does not warn you. It does not throw a code. It just builds — until the day your trip ends in smoke on the shoulder of the highway.
Diesel Pusher Owners — Read This First
CarbonShield RV Catalytic + Fuel System Cleaner
$49.00
$79.00
SAVE
38%
One bottle. One tank. The maintenance your mechanic never reminds you to do.
- Dissolves carbon deposits in one tank — no disassembly needed
- Brings back the MPG you had when you first drove off the lot
- Works on every diesel and gasoline RV, motorhome, and Class A
- One bottle per 5,000 miles — the maintenance your mechanic skips
- Safe for all seals, hoses, and catalytic components
Works in Any RV. No Disassembly. Results in One Tank.
60-day money back guarantee — no questions asked
1-Year Warranty — Because We Built This to Last
HaulGuard™ is covered for a full year against defects and hardware failure. That's how confident we are in what we built. Not thrilled? Return it within 60 days for a full refund — no questions.
Mike T.
"Asked my mechanic directly if he checks the catalytic system. He said it is not on the standard checklist unless a code fires. That means 80,000 miles unchecked. Ordered the 5-pack the same day and the rough idle I had accepted as normal for two years is completely gone."
The real problem nobody tells you
What's Destroying Your Engine
Right Now While You Drive
You service the oil. The filters. The tires. But there is one part of your engine that accumulates damage silently — and your mechanic never checks it unless there is already a code. By then, the damage is done.
Catalytic Overheating
Carbon-loaded unburned fuel entering a clogged converter spikes internal temperatures beyond safe operating range. The substrate melts. Fuel ignites inside the exhaust. The fire works backward into your engine bay.
1,600°F Peak catalytic temperature when carbon-loadedSilent MPG Drain
Every 5,000 miles without treatment, carbon deposits tighten the fuel system. Your MPG drops 0.4 to 0.8 per gallon. You blame the wind. You blame the load. Meanwhile the real cause is silently getting worse every mile.
-14% Average fuel economy loss from carbon buildupInjector Failure
Carbon deposits on injector tips cause misfires, rough idle, and weak acceleration. When injectors fail completely on a diesel pusher mid-trip, you are not limping home. You are calling a flatbed and writing a check for $4,000+.
$4,200 Average engine repair from carbon seizureExhaust Contamination
A dirty catalytic converter produces exponentially more particulate matter, carbon monoxide, and unburned hydrocarbons. Full-timers breathing this daily at campsites — and your dogs and family inside the rig — are the ones paying the real price.
8× More emissions from a clogged cat vs clean oneEngine Bay Fire Risk
This is not theoretical. Catalytic converter fires in RVs and diesel vehicles are documented annually by fire departments across the US. A clogged, overheating converter is the leading non-electrical cause of engine bay fires in Class A motorhomes.
#1 Non-electrical cause of RV engine bay firesNo Warning System
Your check engine light will not catch this. Your mechanic's standard service checklist does not include catalytic carbon inspection. There is no alert, no code, no noise. It builds for years — and the first symptom is often the last thing your engine does.
0 Warning signs before catastrophic failure"The fire investigator was not surprised by what he found. He showed me the catalytic converter — or what was left of it. He said: Standard service does not include catalytic system inspection. Most RV mechanics do not even look at it unless there is a code. By the time there is a symptom, the damage is already done."
Diane R. — Full-time Class A diesel owner, 6 years on the road
A full-timer's story
Please Stop Ignoring Your Catalytic ConverterLike I Did.
I thought I was doing everything right. Oil changes on schedule. Filters every season. New tires before every long run.
Nobody told me the one part I never touched was quietly turning into a 1,600 degree time bomb every single time I drove.
It started with a smell. Not a strong smell. Not a burning smell. Just something slightly off — the kind of thing you notice for half a second and then convince yourself is just truck exhaust from the vehicle ahead of you.
I noticed it at mile marker 211. By mile marker 219, the smell was stronger. By mile marker 223, I saw the first wisp of smoke in my rearview mirror.
"At mile marker 225 I pulled over. What I found was smoke pouring from every seam of the engine bay access panel. I called 911. I grabbed my dog. I walked to the far side of the highway barrier and stood there while my home — everything I owned, six years of full-time life — began to fill with smoke sixty feet away from me."
The fire investigator found years of progressive carbon buildup that had forced the converter to run hotter and hotter until unburned fuel ignited inside the exhaust system. The fire worked backward into the engine bay.
How long does this take to build up? Years, he said. It is slow. Completely invisible. Your engine runs fine right up until it does not.
After the fire, I spent three weeks researching everything I could find. Here is the thing that made me angriest: This is completely preventable. One bottle of detergent-based fuel additive per five thousand miles dissolves carbon deposits before they reach the converter. Cleaner burn. Lower catalyst temperature. No accumulation.
It costs eighteen dollars. My engine cost $240,000.
I have been in RV Facebook groups for six years and I have never once seen anyone talk about this. The forums talk about tire blowouts. Mouse damage. Roof leaks. Nobody talks about this.
Now you know. Do not wait until mile marker 225 to find out the way I did.
-
— Diane R., full-timer, Class A diesel, 6 years on the road
What CarbonShield RV actually does
Before VS After
One Treatment
The difference between an engine that ran clean last year and one that is silently failing right now.
Before CarbonShield RV
Carbon Buildup Active
Catalytic converter running at
1,600°F+ — invisible, undetected
1,600°F+ — invisible, undetected
- Carbon crust building on injector tips every mile
- Catalytic converter running 200-400°F above safe range
- Fuel economy dropping silently — 0.4 to 0.8 MPG per season
- Rough idle and weak acceleration worsening gradually
- Heavy exhaust odor you have accepted as normal
- Engine failure risk increasing with every highway mile
CarbonShield RV
After CarbonShield RV
fire risk eliminated in 100 miles
✨
⚡
✨
💫
Engine Running Clean
Catalytic temp normalized —fire risk eliminated in 100 miles
- Carbon deposits dissolved before they reach the converter
- Catalytic temperature returning to safe operating range
- Fuel economy recovering — documented 8-14% improvement
- Smooth idle and responsive acceleration restored
- Clean exhaust — safer for you, your family, and your dogs
- Engine running the way it did at 10,000 miles
What CarbonShield RV actually does
How One Bottle Cleans Your Entire Engine
The chemistry that works while you drive. No shop visit. No disassembly. No downtime.
01
Detergent Solvents Enter Fuel System
The moment you pour CarbonShield RV into your fuel tank, proprietary detergent solvents begin bonding with carbon molecules throughout the entire fuel delivery system — from tank to injectors to combustion chamber.
02
Carbon Dissolves Mile by Mile
Over your first 100-200 miles of normal driving, deposits are broken down, dissolved, and burned off cleanly through the exhaust. No disassembly. No shop visit. The engine cleans itself as you drive.
03
Catalytic Temperature Normalizes
With cleaner fuel flow and reduced carbon load, your catalytic converter returns to normal operating temperature. The 1,600°F spike risk drops. Your MPG recovers. Your engine runs the way it was built to run.
3 Steps. No Mechanic. No Tools.
Protect Your Engine In 60 Seconds
No disassembly. No shop appointment. No downtime. Just pour it in and drive.
1
Make Sure You HaveAt Least 1/4 Tank You need enough fuel for the solvents to dilute and circulate properly through the full fuel system. Top up before or after — it does not matter.
2
Pour The Full BottleInto Your Fuel Tank One 120ml bottle treats up to 60 litres of fuel. Remove the cap, break the seal, pour the entire bottle directly into your fuel tank. That is the entire installation process.
3
Drive Normally100-200 Miles The cleaner works best under normal driving conditions. No special route needed. Highway miles at cruise speed are ideal. Your engine is cleaning itself while you drive to your next destination.
Real RV owners. Real results.
What Full-Timers Are Saying
4.8 stars · 1,200+ verified RV owner reviews
★★★★★
I was skeptical. Completely skeptical. I have a 2019 Tiffin Phaeton and started noticing MPG dropping last fall — went from 7.9 down to 7.1 over about 15,000 miles. Tried CarbonShield after reading about it in an RV group. Got 7.8 on my next 800-mile run. That is not a placebo. I felt the difference in the throttle response too. Treating every 5,000 miles now without question.
MK
Michael K.
Full-timer · 2019 Tiffin Phaeton 40IH · 87,000 miles
✓ Verified Purchase
★★★★★
My husband is a retired diesel mechanic. He was the hardest person to convince this worked. After he checked my engine before and after the first treatment and saw the injector readings, he now uses it on both our rigs and tells every diesel owner he meets about it. When a diesel mechanic changes his mind, that tells you everything. This is the real deal.
SB
Sandra B.
Full-timer · 2021 Newmar Dutch Star · 44,000 miles
✓ Verified Purchase
★★★★★
I read Diane's story in a Facebook group and it scared the living daylights out of me. Ordered immediately. I have a 2017 Fleetwood Discovery and I have never once — not once in six years — heard anyone mention catalytic carbon risk. I drove 22,000 miles last year. I had no idea. Treated it the same day I got the bottles. Smooth as the day I bought it. This should be in every RV owner's maintenance routine.
RJ
Robert J.
Full-timer · 2017 Fleetwood Discovery 40G · 112,000 miles
✓ Verified Purchase
Don't Wait for Mile Marker 225.
The average RV engine fire caused by catalytic overheating happens after 3-5 years of untreated carbon buildup. Where are you in that timeline?
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Works on Every RV Engine
Don't Wait for Mile Marker 225.
The average RV engine fire caused by catalytic overheating happens after 3-5 years of untreated carbon buildup. Where are you in that timeline?
BUY NOW
60-Day Money Back Guarante
Free Shipping
Works on Every RV Engine
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Questions Answered
Does this actually work on a diesel pusher Class A?
Yes. CarbonShield RV is specifically formulated for high-displacement diesel engines including Class A pushers, Class C motorhomes, and diesel-powered fifth wheels. The detergent chemistry works identically in diesel and gasoline fuel systems. Diesel pushers with 30,000+ annual highway miles benefit most from regular treatment.
My engine runs fine. Do I still need this?
This is exactly the point. Carbon buildup shows no symptoms until it is advanced. Your engine will run fine — slightly worse than it ran two years ago, but fine — right up until a sudden failure event. The RV owners who suffered engine fires or seized engines all reported their engine was running normally beforehand. Preventive treatment is the entire product.
How often should I treat my RV engine?
Every 5,000 miles is the recommended interval for full-timers and heavy drivers. For seasonal RV owners putting 8,000-15,000 miles per year, treating once before storage and once at the start of the season covers the full calendar year. The 3-pack handles most full-timers for an entire season.
Is this safe for my catalytic converter and exhaust system?
Yes. The formula is specifically designed to work with catalytic converters — it does not contain any compounds harmful to catalytic substrates, oxygen sensors, or DPF filters. The chemistry is solvent-based and burns off completely during normal combustion. It leaves no residue.
My mechanic said I don't need this — should I trust them?
Your mechanic is not wrong that standard maintenance keeps your engine running. But standard maintenance does not include catalytic carbon inspection. This is a documented gap in RV service protocols. Your mechanic services what they can see and measure. Carbon buildup in the catalytic system is invisible until it is catastrophic.
How quickly will I notice results?
Most RV owners report smoother idle and improved throttle response within the first 100 miles. Fuel economy improvement becomes measurable within the first full tank after treatment — typically 0.4 to 0.8 MPG on a diesel pusher, which translates to $200-400 in fuel savings per season. Exhaust odor reduction is usually noticeable immediately.