Cummins Three-Way Catalyst FAQ : The Brief Is Not The Article

Cummins has achieved a magnificent feat of corporate incompetence. The company published a customer-facing technical FAQ about the X15N natural-gas engine, then repeatedly explained how its own experts wanted the article written. Among the revelations sits a particularly delicious instruction not to criticise diesel, which Cummins happens to sell by the fucking truckload. What should have been a straightforward explanation of emissions technology now resembles a corporate magic show where the magician reveals the trapdoor, introduces the bloke pulling the ropes and explains precisely how the audience should react. Welcome to the Cummins newsroom, where even the editorial briefing appears to qualify as finished journalism.

Some things belong behind the scenes. Research notes, editorial instructions and delicate discussions about protecting competing product lines usually stay in the meeting room. The communications team takes that material, writes something coherent and publishes the result. Readers receive the finished article rather than a guided tour of the sausage factory, complete with a helpful explanation of which bits of the pig management wanted to emphasise.

Cummins appears to have misplaced that distinction. On 23 October 2026, the company published Three-Way Catalyst FAQs: What Fleets Should Know, an explanation of the aftertreatment system fitted to its X15N natural-gas engine. Fleet operators could reasonably expect answers about emissions, maintenance and operating costs. They get those, but they also receive three remarkable glimpses of the discussions behind the article. Somewhere between the technical briefing and publication, the stage directions appear to have wandered onto the stage and started addressing the audience.

The Brief Has Escaped Its Enclosure

The trouble begins almost immediately. Cummins explains that the X15N avoids diesel exhaust fluid, diesel particulate filters and regeneration. These differences can reduce maintenance demands and help trucks spend less time in workshops. So far, so sensible. A fleet operator might appreciate knowing which expensive components no longer require attention, especially when the alternative involves paying somebody to clean soot from a filter.

Unfortunately, Cummins cannot leave the explanation alone. The introduction proceeds to tell readers that these benefits reflect the priorities its subject-matter experts identified when discussing how to communicate the X15N story. Those priorities include simplicity, maintenance, uptime and total cost of ownership. Apparently, the company’s technical specialists believe customers care about running costs and keeping their vehicles on the road. What a staggering fucking discovery.

Imagine opening a Mercedes brochure and finding a paragraph explaining that the marketing department had agreed to emphasise comfort, prestige and interior quality. You would probably wonder why Mercedes was telling you about the meeting instead of showing you the car. Cummins has managed something remarkably similar, except its subject involves catalytic converters rather than heated leather seats.

The Experts Have Discovered Marketing

Nobody objects to technical experts advising communications teams. Anyone writing about emissions technology should consult engineers who understand the equipment. They can explain chemical reactions, operating temperatures and maintenance requirements far better than someone whose chief qualification involves rearranging adjectives on LinkedIn.

The problem begins when the article treats those editorial discussions as information the customer needs. Cummins does not merely explain the benefits. It explains why its experts considered those benefits important to the company’s messaging. A three-way catalyst controls pollutants; it does not require a supplementary presentation about the committee responsible for selecting its most attractive features.

This is where the Cummins three-way catalyst FAQ starts resembling a document that escaped before somebody finished editing it. The briefing notes have apparently climbed into the finished prose, pulled up a chair and ordered drinks. Nothing in the wording proves an accidental leak, but the effect is unmistakable. The customer has arrived for an engineering explanation and somehow gained admission to the communications workshop.

The experience resembles ordering dinner and receiving the chef’s recipe alongside the marketing department’s instructions for making the chicken sound exciting. The chicken might taste perfectly good. You still have to wonder why somebody thought the fucking recipe belonged on your plate.

Whatever You Do, Don’t Slag Off The Diesel

The article’s finest moment arrives during a comparison between natural-gas and diesel aftertreatment. Cummins explains that conventional diesel systems use selective catalytic reduction, diesel exhaust fluid and particulate filtration. The X15N takes a different approach. Its three-way catalyst operates without DEF or a diesel particulate filter, which removes several routine maintenance requirements.

These are useful technical differences. Cummins could explain them, describe their practical consequences and allow customers to evaluate the two systems. Instead, the company decides to share this astonishing sentence:

“Cummins SMEs specifically recommended focusing on those factual differences rather than positioning the technology as a criticism of diesel”.

What the actual fuck is that doing in a customer FAQ?

The sentence does not explain how the catalyst works. It explains how Cummins’ experts wanted somebody to discuss the catalyst. That distinction should be obvious to anyone who has ever written a professional document, edited a newspaper or prepared a school presentation without accidentally including the teacher’s marking instructions.

Yet there it sits, perfectly comfortable among the technical explanations. Cummins has effectively handed readers the editorial guidance and invited them to admire the finished article simultaneously. It is the corporate equivalent of a magician announcing that management specifically instructed him to distract the audience with his left hand.

The Diesel Division Must Not Be Offended

The commercial logic behind that instruction is wonderful. Cummins manufactures both diesel and natural-gas engines. It wants customers to appreciate the simpler aftertreatment requirements of the X15N without concluding that its diesel systems involve unnecessary complication.

That is an understandable position for a manufacturer with a broad product range. Nobody expects Cummins to spend Thursday advertising diesel engines and Friday describing those same engines as mechanical bowel obstructions. Different technologies suit different applications, and the company has every reason to explain their advantages without denigrating either.

But the communications department appears to have confused following that strategy with announcing it. Instead of quietly producing a balanced comparison, the FAQ tells customers that the experts recommended avoiding criticism of diesel. The audience now gets to watch the company protect its own commercial interests while explaining how it intends to protect them.

It is like a car salesman praising an electric vehicle before adding that his manager specifically instructed him not to make the petrol models look like obsolete piles of shit. The customer did not need that information. Nevertheless, it reveals rather more about the sales pitch than the salesman probably intended.

Thursday’s Wonderful Diesel Plumbing

The timing makes the episode even better. On 22 October, just one day before the natural-gas FAQ, Cummins published Twin Module Aftertreatment FAQ: Common Questions About Cummins’ 2027 Diesel Aftertreatment System.

That article celebrates the engineering behind the company’s updated diesel emissions equipment. The Twin Module system supports its 2027 X10 and X15 applications. It uses familiar components, including diesel oxidation catalysts, particulate filters and selective catalytic reduction. Cummins also describes electric heating, updated catalyst technology and a parallel-flow SCR design.

There is genuine engineering behind these systems. Modern diesel engines must control pollutants across demanding operating conditions. Cold starts and low-load operation create particular challenges, so Cummins has developed ways to manage exhaust temperatures and emissions performance. The company also emphasises service access and familiar maintenance arrangements.

Thursday’s message presents the complexity as a triumph of engineering. Cummins has assembled an impressive collection of technology to keep diesel engines compliant, dependable and commercially attractive. Customers should admire the work, appreciate the expertise and recognise the benefits of the company’s updated design. Everybody can congratulate themselves on another successful visit to the enormous industrial plumbing department.

Friday’s Wonderful Lack Of Plumbing

Then Friday arrives, and Cummins discovers the advantages of not having so much plumbing in the first place. The X15N’s natural-gas system requires no DEF, no DPF cleaning and no regeneration process. Its three-way catalyst has no routine service schedule, according to the company, and designers intend it to last for the vehicle’s working life.

Suddenly the absence of equipment becomes a powerful selling point. Fewer maintenance tasks can mean less workshop time, lower servicing costs and fewer opportunities for a truck to sit around earning precisely fuck all. Cummins presents this simpler arrangement as another compelling reason to consider its engines.

The contrast is magnificent. On Thursday, the company celebrates the sophisticated equipment required to manage diesel emissions. On Friday, it celebrates avoiding several of those requirements entirely. One article invites admiration for the elaborate engineering; the next invites admiration for its absence.

Neither argument must be technically wrong. Diesel and natural-gas engines have different combustion characteristics and emissions-control needs. But the marketing gymnastics deserve their own Olympic event. Cummins has developed the remarkable ability to present both the complexity and the removal of complexity as excellent reasons to purchase another Cummins product.

Two Menus, One Corporate Kitchen

Imagine a restaurant selling an enormous steak on Thursday. The chef spends twenty minutes describing the careful preparation, specialised equipment and expensive cooking process. Every detail supposedly contributes to a superior dining experience.

On Friday, the same restaurant launches a vegetarian menu. The chef now celebrates avoiding several demanding preparation steps, reducing kitchen complexity and saving customers time. Both meals might be excellent, but somebody in the kitchen has apparently instructed the staff not to make the steak sound like a ridiculous fucking undertaking.

Cummins faces a similar balancing act. Diesel technology requires one collection of emissions equipment, while the X15N uses another. The company understandably wants to sell both without undermining either. Its engineers can explain the differences, and customers can evaluate the costs against their own operating requirements.

The comedy arises because Cummins has announced that balancing act inside the sales material itself. Instead of simply presenting a fair comparison, it tells readers how its experts recommended presenting the comparison. The company has exposed the commercial choreography while attempting to perform the dance, leaving the audience watching the instructor count the fucking steps.

Three Editorial Fingerprints On The Glass

One awkward reference to the briefing might have escaped notice. Corporate writing rarely wins awards for elegance, and even capable editors occasionally allow a peculiar sentence into print. Cummins, however, returns to its experts’ messaging discussions three separate times.

The introduction identifies the benefits its subject-matter experts considered important when communicating the X15N story. Later, the diesel comparison contains the explicit instruction about avoiding criticism of competing technology. Near the conclusion, the article again refers to the experts’ discussion, this time explaining that economic value formed a central theme.

Three separate passages draw attention to how Cummins developed its promotional message. The pattern makes the FAQ feel less like a polished customer explanation and more like a technical briefing whose author forgot to remove the editorial scaffolding.

Perhaps the writer deliberately chose that approach. Perhaps nobody recognised how peculiar it sounded. The public article cannot answer those questions, and TCAP has no reason to invent an internal scandal. Cummins has already supplied something far more useful: a finished publication that repeatedly interrupts its own technical explanation to explain the thinking behind the explanation.

Somewhere in Columbus, an editor has apparently decided that readers want the PowerPoint slides as well as the fucking presentation.

The Experts Discover That Customers Like Money

The third reference deserves special attention because it appears near the end of the FAQ. By that point, Cummins has spent considerable time explaining the potential economic benefits of natural-gas aftertreatment. Customers hear about avoiding DEF purchases, reducing servicing requirements and keeping vehicles available for work.

The company also acknowledges that actual savings depend on the fleet, application and maintenance practices. This is sensible information. A transport operator needs realistic costs, not a promotional fairy tale in which every technical advantage magically becomes a cheque from the maintenance department.

Having explained those benefits, Cummins then reveals that broader economic value formed a central theme in its experts’ discussions. Apparently, the specialists considered money important when discussing a product intended for businesses that spend enormous sums on vehicles, fuel and maintenance.

Well, fuck me sideways. Next week, perhaps, the newsroom will reveal that its sales department wants customers to buy engines. The finance team might follow with an exclusive investigation into the mysterious relationship between revenue and profitability. By Christmas, somebody could discover that diesel engines require fuel, although Cummins will presumably need another technical workshop before deciding how to communicate the finding.

A Fleet Manager Accidentally Joins The Meeting

Consider the person Cummins supposedly wants to help. A fleet operator evaluating the X15N needs practical information. Will the engine suit existing routes? Where can drivers refuel? How do maintenance schedules compare with diesel? Do the projected savings justify the investment?

Those questions matter because commercial vehicles cost serious money. Downtime can destroy operating margins, and a promising maintenance saving means little if fuel infrastructure creates different problems. Customers need to evaluate the whole operation rather than admire one component in isolation.

The catalyst information helps with that assessment. Cummins explains its emissions-control function, its lack of routine maintenance and the differences from diesel systems. The article also notes that the X15N engine still needs regular servicing, including spark-plug replacement. That distinction matters because a maintenance-free catalyst does not make the entire fucking truck maintenance-free.

Now imagine that operator sitting in a workshop surrounded by invoices and a vehicle with an expensive personality disorder. He opens the Cummins website hoping to understand aftertreatment costs. Instead, he finds paragraphs discussing the experts’ preferred messaging priorities. The bloke wants to know whether his trucks will spend less time on the ramps; Cummins wants him to appreciate how thoughtfully its team prepared the sales argument.

Somebody Forgot Who The Audience Was

A useful FAQ should answer questions. That is the entire concept, and it has served humanity reasonably well without requiring a rebrand from a multinational engine manufacturer. Customers ask about technology, and the manufacturer explains what the equipment does.

Cummins has allowed the distinction between its audience and its editorial process to become strangely blurred. The experts’ knowledge belongs in the article. Their instructions about how to present that knowledge generally do not.

It resembles a dreadful university group project where everybody spends six weeks debating the presentation. Nobody remembers who was supposed to bring the projector, but the final submission includes seventeen slides describing how the group allocated its responsibilities. The lecturer receives the meeting minutes, the project-management diagram and a lengthy explanation of why the team selected blue headings.

The actual assignment sits underneath the administrative debris, desperately trying to attract attention. Cummins’ engineering information suffers a similar indignity. Its perfectly legitimate technical explanation shares the stage with an unnecessary account of the communications process. For a company celebrating simple aftertreatment, it has found a remarkably complicated way to explain something straightforward.

Corporate Ventriloquism With The Strings Showing

Large manufacturers depend on technical specialists to explain complex products. Engineers understand combustion, chemical reactions, catalyst performance and mechanical systems. Communications staff translate that expertise into material customers can use. Each group has a job, and the finished article should reflect the benefits of that collaboration.

Cummins’ October FAQ occasionally resembles a puppet show where the puppeteer stands beside the dummy and explains which lines management approved. The audience is supposed to concentrate on the performance, but the bloke controlling the puppet keeps interrupting to explain why he chose a particular joke.

Eventually, nobody pays attention to the puppet. Everybody watches the hand going up its arse.

The effect becomes especially absurd when the article reveals the instruction about diesel. Cummins wants natural-gas customers to appreciate simpler aftertreatment without viewing diesel technology negatively. That is ordinary product positioning. Yet the FAQ turns the positioning decision into part of the public explanation, exposing the machinery behind the message.

Nobody needed a leaked memo to discover that Cummins wants to protect both product lines. The company has volunteered the information itself. It has taken a reasonable commercial concern and transformed it into a wonderfully unnecessary public announcement about its own communications strategy.

The Newsroom Needs A Bullshit Catalyst

Cummins spends considerable resources developing aftertreatment systems. Its engineers use catalysts, filters and carefully managed chemical reactions to control pollutants before exhaust leaves the vehicle. These systems require expertise, precision and extensive testing.

Perhaps somebody should introduce similar technology to the newsroom, where the raw material enters as technical discussion, research notes and commercial objectives. A competent editorial process should turn that mixture into clear customer information while removing unnecessary corporate debris.

TCAP proposes a communications particulate filter. It could capture phrases describing the experts’ preferred editorial approach before those phrases reach the public. A supplementary bullshit catalyst might remove meeting-room jargon, redundant commercial explanations and any paragraph that begins discussing how the article should communicate its own contents.

Engineers could even install a warning light that illuminates whenever the writer copies material from the briefing instead of translating it into useful prose. The dashboard would display THAT BELONGS IN THE FUCKING BRIEF, followed by instructions to contact the nearest competent editor.

Unfortunately, the October FAQ suggests that this particular editorial emissions system has developed a serious bypass problem. The technical discussion entered one end, the finished article emerged from the other and three conspicuous references to the communications strategy survived the journey. Somebody might want to inspect the filter before another PowerPoint presentation escapes through the exhaust.

The Engineering Giant And The Missing Editor

The irony grows when you consider the wider company. Cummins sells sophisticated powertrains, diagnostic technology and complex systems that manage enormous mechanical forces. Its engineers work with precise measurements, demanding regulations and difficult operating conditions.

Meanwhile, the communications department has produced an article that occasionally reads like somebody accidentally exported a meeting summary into the customer portal. The company can explain parallel-flow selective catalytic reduction and electric heating, yet the distinction between an editorial instruction and a finished paragraph appears to present an unexpected challenge.

Perhaps the problem involves the pace of corporate publishing. Every product needs an explanation, every technical development needs promotion and every business unit wants its own moment beneath the newsroom spotlight. Eventually, the content machine begins demanding material faster than anyone can properly inspect it.

That possibility would explain the peculiar result, although the public record does not establish Cummins’ actual drafting process. What we can see is a company publishing three references to its experts’ messaging discussions inside a customer FAQ. Whatever happened behind the scenes, the final editorial product looks distinctly undercooked.

It is rather like buying a beautifully engineered truck only to discover that the manufacturer left the assembly checklist on the dashboard, protective wrapping around the steering wheel and half the fucking packaging in the cab.

Nobody Needs To Invent A Scandal

There is an important distinction between mocking the published article and pretending to know how Cummins produced it. The wording does not prove that somebody accidentally leaked a confidential brief. It does not establish whether artificial intelligence assisted the drafting process, and it certainly does not show that the engineers gave incorrect technical advice.

Those explanations remain speculative. The publicly available material, however, supports a much simpler observation: Cummins repeatedly refers to the discussions that shaped its messaging instead of merely presenting the resulting technical information.

That is the editorial failure TCAP finds so entertaining. We do not need secret documents, anonymous sources or dramatic theories about corporate sabotage. The company placed the material on its own website, complete with a publication date and a helpful title explaining that customers should find answers to their questions.

The funniest corporate embarrassments rarely require an elaborate investigation. Sometimes a company publishes precisely what it wants the public to read, and the result proves considerably more revealing than intended. Cummins has supplied the joke, delivered the setup and left its communications strategy hanging in the window like a pair of freshly washed corporate underpants.

The Brief Is Not The Fucking Article

Cummins wanted to explain why the X15N’s three-way catalyst could offer practical advantages to commercial fleets. That was a legitimate subject, and much of the article performs the task. The company explains the technology, describes its maintenance requirements and identifies potential economic benefits.

Unfortunately, it also repeatedly tells customers how its experts wanted those benefits presented. The most revealing sentence concerns neither emissions chemistry nor operating costs. It concerns the recommendation to avoid criticising diesel, which becomes particularly amusing when readers compare the natural-gas article with the previous day’s celebration of diesel aftertreatment.

Cummins spent Thursday praising the sophistication of its diesel emissions equipment and Friday celebrating the simplicity of a system that avoids several diesel maintenance requirements. Both technologies emerge as engineering triumphs, both promise advantages and both ultimately lead customers towards another Cummins product. The company even explains why its experts wanted the second argument to avoid undermining the first.

The only obvious casualty is the editorial process, which appears to have fallen off the communications vehicle somewhere between the briefing room and the publish button.

Somewhere in Columbus, the next technical workshop may already be taking shape. Perhaps the agenda will include another discussion about product benefits, customer priorities and how to protect the wider engine portfolio. TCAP has a modest suggestion for the final slide: THE BRIEF IS NOT THE FUCKING ARTICLE.

Although, given the evidence of this latest effort, Cummins will probably publish that instruction too.

Lee Thompson – Founder, The Cummins Accountability Project

Cummins Confidential : The Brief Is Not The Fucking Article