Corporate Accountability Project | Investigative Reporting
Class Action Complaint · Colorado · January 2026
King Soopers and HF Sinclair Poisoned Colorado’s Gas Supply
More than 400,000 gallons of diesel-contaminated unleaded gasoline reached at least 46 Colorado gas stations, destroying engines and stranding thousands of drivers with no warning.
● Critical Severity
TL;DR
On January 7, 2026, HF Sinclair Corporation loaded diesel-contaminated fuel into transport trucks at its Henderson, Colorado terminal and sent it out across the Front Range. King Soopers, Costco, Safeway, Circle K, and other retailers sold that fuel to drivers who had no idea what they were pumping into their tanks. Engines sputtered, stalled, and failed. Over 600 complaints flooded state regulators within a week. The lawsuit is clear: Defendants knew, or should have known, and they sold it anyway without warning. The bill for their negligence landed squarely on working families whose only means of transportation is now sitting at a dealership.
Every dollar spent on a tow truck, a rental car, or a blown engine is a dollar these companies owe. Demand accountability now.
400K+
Gallons of contaminated fuel estimated in circulation
600+
Consumer complaints filed with Colorado regulators by Jan. 15, 2026
46
Gas stations across 11 Colorado counties confirmed contaminated
13
King Soopers locations identified as selling contaminated fuel
$5M+
Minimum class action controversy threshold alleged
3,000
Gas station owners notified by state regulators about contamination
⚠️ The Allegations: A Breakdown
Core Allegations
What they did · 5 points
▼
| 01 | HF Sinclair Corporation loaded diesel-contaminated unleaded gasoline into transport vehicles at its Henderson, Colorado terminal, beginning in the early afternoon of January 7, 2026, without detecting or disclosing the contamination. | high |
| 02 | Contaminated fuel was distributed to retailers across the Colorado Front Range and sold to consumers as standard unleaded regular and plus grade gasoline, a misrepresentation of the product’s grade and suitability. | high |
| 03 | King Soopers sold diesel-contaminated fuel at a minimum of 13 locations during the window of January 7 to January 8, 2026, while knowing or recklessly disregarding the risks of diesel in gasoline-powered vehicles. | high |
| 04 | Defendants failed to implement reasonable quality control, inspection, testing, and monitoring procedures that would have detected the contamination before fuel reached consumers. | high |
| 05 | After contamination became apparent, Defendants failed to timely shut down affected pumps or warn consumers, allowing continued sales of dangerous fuel and compounding the harm to drivers already affected. | high |
Regulatory Failures
How oversight broke down · 4 points
▼
| 01 | The Colorado Division of Oil and Public Safety did not receive its first consumer contamination complaints until January 8, 2026, the day after the contaminated fuel was already in distribution, meaning state oversight activated only after the damage had begun. | high |
| 02 | A Division inspector visually identified diesel contamination in regular unleaded tanks at a Costco in Sheridan, Colorado at 10:00 a.m. on January 8, 2026, the same day complaints were first being logged, revealing that industry partners had prior knowledge and had not yet acted. | high |
| 03 | Regulators did not notify approximately 3,000 gas station owners statewide about the contamination event until January 10 through 11, 2026, three to four days after contaminated fuel began flowing into consumer vehicles. | medium |
| 04 | Sinclair only provided regulators with a full list of 46 affected stations across 11 counties after the Division formally requested it, indicating that the company withheld critical public safety information until compelled to share it. | high |
Economic Fallout for Consumers
Financial harm to drivers · 5 points
▼
| 01 | Draining and flushing a diesel-contaminated gas tank alone can cost hundreds of dollars; if the vehicle was driven after fueling, additional repairs including spark plug replacement, fuel injector servicing, filter replacement, and in severe cases, complete engine replacement can cost several thousand dollars or more. | high |
| 02 | Plaintiff Lindsey DeHart paid $36.72 for 14.81 gallons of fuel she believed was safe unleaded plus gasoline; her 2024 Subaru Outback was towed the next morning and remained at the dealership as of January 27, 2026, the filing date of the complaint. | high |
| 03 | Consumers who had their vehicles towed faced additional out-of-pocket costs including towing fees, diagnostic testing fees, rental car charges, and lost wages from time spent managing the crisis, none of which they caused. | high |
| 04 | Vehicles that required repair due to diesel contamination may also suffer diminished resale value, even after repairs are completed, creating a long-term financial loss beyond the immediate repair costs. | medium |
| 05 | For consumers whose vehicle is their only means of transportation, the loss of use created cascading economic harms: missed work, inability to reach medical appointments, and reliance on expensive alternatives like rideshare services. | high |
Public Safety Risks
Unsafe product on public roads · 4 points
▼
| 01 | Even small amounts of diesel mixed into unleaded gasoline can cause immediate drivability failures in gasoline-powered vehicles, including sputtering, hesitation, misfiring, loss of acceleration, stalling, and catastrophic engine failure, especially when a driver fills a nearly empty tank. | high |
| 02 | Diesel contamination can damage fuel pumps, injectors, fuel lines, and filters in ways that persist even after the tank is drained, depending on how much diesel entered and how long the engine ran on mixed fuel. | high |
| 03 | Drivers experienced sudden and dangerous vehicle failures on public roads after fueling, creating a public safety hazard for themselves and other motorists, a foreseeable risk that Defendants did nothing to prevent or mitigate in time. | high |
| 04 | Consumers have no ability to detect diesel contamination at the point of sale; the fuel looks and smells similar to regular gasoline, leaving drivers entirely dependent on Defendants to ensure the product is safe before it reaches the pump. | medium |
Corporate Accountability Failures
Deception, delay, and insufficient action · 5 points
▼
| 01 | The complaint alleges Defendants knowingly or negligently passed off contaminated fuel as unleaded gasoline, constituting a deceptive trade practice under the Colorado Consumer Protection Act, which prohibits misrepresenting the characteristics and quality of goods sold to consumers. | high |
| 02 | Defendants failed to disclose material information about the contamination at the time of sale, a violation of the Colorado Consumer Protection Act, and one that, the complaint alleges, directly induced consumers to purchase a product they would have refused if truthfully informed. | high |
| 03 | Sinclair retained payments from retailers for contaminated fuel, and retailers including King Soopers retained payments from consumers, representing unjust enrichment from a product Defendants knew was defective or unreasonably dangerous. | high |
| 04 | The complaint alleges Defendants’ violations were willful, which would entitle the class to treble damages under Colorado law, reflecting the seriousness of knowingly placing a dangerous product on the market without adequate warning. | high |
| 05 | Without a class action, the complaint argues, Defendants would retain the benefits of their wrongdoing, since individual claims are too small relative to litigation costs for most affected drivers to pursue independently, allowing corporate negligence to go unaddressed. | medium |
🕐 Timeline of Events
Jan. 7, 2026 (afternoon)
Diesel-contaminated unleaded gasoline is loaded from HF Sinclair’s Henderson, Colorado terminal into transport vehicles and distributed to retailers across the Colorado Front Range.
Jan. 7-8, 2026
King Soopers, Costco, Safeway, Circle K, Murphy Express, and other retailers receive and sell contaminated fuel to consumers as unleaded regular and plus grade gasoline.
Jan. 8, 2026 (7:15 a.m.)
Plaintiff Lindsey DeHart fills her 2024 Subaru Outback with 14.81 gallons of contaminated fuel at King Soopers in Castle Rock, Colorado.
Jan. 8, 2026 (10:00 a.m.)
A Colorado Division of Oil and Public Safety inspector visually identifies diesel contamination in unleaded tanks at a Costco in Sheridan, Colorado. Industry partners confirm awareness of the issue.
Jan. 9, 2026
Plaintiff’s Subaru struggles to start, makes “chugging” sounds, and is towed to a dealership. By midday, Colorado regulators have received more than 200 separate consumer complaints.
Jan. 10-11, 2026
Colorado regulators notify approximately 3,000 gas station owners statewide about the contamination event and associated risks.
Jan. 14, 2026
HF Sinclair provides regulators with a list of 46 gas stations across 11 Colorado counties that received contaminated fuel.
Jan. 15, 2026
Colorado’s Division of Oil and Public Safety has received more than 600 complaints and continues to process new claims.
Jan. 26, 2026
Subaru dealership confirms via sample testing that Plaintiff DeHart’s fuel tank is contaminated with diesel. Her car remains at the dealership.
Jan. 27, 2026
Class Action Complaint filed in U.S. District Court for the District of Colorado against Dillon Companies (King Soopers) and HF Sinclair Corporation on behalf of all affected Colorado consumers.
💬 Direct Quotes from the Legal Record
Quote 1
Scope of contamination
Core Allegations
“Petroleum marketers estimate that at least 400,000 gallons of fuel may have been affected.”
💡 This figure establishes the industrial scale of the contamination. This was not a local accident at a single pump; it was a systemic distribution failure affecting potentially hundreds of thousands of consumers.
Quote 2
Recklessness finding
Core Allegations
“Defendants obviously acted negligently and recklessly, and failed to implement reasonable quality control, inspection, testing, oversight, supervision, and monitoring procedures to prevent fuel contamination, and also failed to timely warn consumers once contamination occurred.”
💡 The complaint uses the word “obviously,” signaling that the failure to detect this contamination was not a close call. Basic industry safeguards were absent or ignored.
Quote 3
Consumer detection impossibility
Public Safety Risks
“Individual consumers lack the ability to detect fuel contamination at the point of sale.”
💡 This goes to the heart of why corporate accountability matters here. Consumers trusted the product label. They had no alternative. That trust was broken by Defendants’ negligence.
Quote 4
Engine damage severity
Public Safety Risks
“Even small amounts of diesel mixed into unleaded gasoline can cause immediate drivability issues, injector fouling, fuel system damage, and catastrophic engine failure.”
💡 The word “catastrophic” is significant in a legal filing. The complaint affirms that this was not a minor inconvenience; it was foreseeable destruction of property on a massive scale.
Quote 5
Plaintiff’s direct experience
Economic Fallout
“When Plaintiff attempted to start her vehicle the following morning, on January 9, 2026, the engine struggled to start and began making ‘chugging’ sounds.”
💡 This is the human reality behind the legal language: a person who did nothing wrong woke up to a broken car, a tow bill, and no way to get to work.
Quote 6
Willful violation, treble damages
Corporate Accountability Failures
“Defendants’ violations were willful, entitling Plaintiff and Class members to treble damages under C.R.S. § 6-1-113(2)(a).”
💡 Treble damages are reserved for conduct the law treats as deliberate or grossly reckless. This allegation, if proven, would multiply compensation to reflect the severity of Defendants’ disregard for consumer safety.
Quote 7
Unjust enrichment
Corporate Accountability Failures
“For Defendants to retain the benefit of the payments under these circumstances is inequitable.”
💡 King Soopers and Sinclair were paid for a product they could not deliver safely. The complaint demands that those profits be returned, because keeping them would mean profiting directly from harm caused to consumers.
Quote 8
Cascading consumer harm
Economic Fallout
“The economic costs incurred by consumers as a result of pumping diesel into non-diesel engines can include, without limitation, mileage charges, towing charges, diagnostic fees, rental car costs, lost wages, and loss of use.”
💡 This list illustrates how a single tank of contaminated gas can spiral into a financial crisis for families living paycheck to paycheck, with no fault of their own.
💬 Commentary
How did 400,000 gallons of contaminated fuel make it to consumers?
▼
According to the complaint, the contamination originated at HF Sinclair’s terminal in Henderson, Colorado, where diesel was loaded into transport trucks alongside, or in place of, unleaded gasoline. Those trucks then made deliveries to retailers across the Front Range. The complaint alleges that Defendants lacked adequate quality control, testing, and inspection procedures that would have caught this before the fuel left the terminal. The fact that 600 complaints poured in within a week and 46 stations across 11 counties were confirmed contaminated points to a supply chain failure of extraordinary scale, one that competent oversight should have prevented.
How serious is diesel contamination for a gasoline vehicle?
▼
Extremely serious. Gasoline engines are engineered to ignite fuel with a spark; diesel fuel ignites differently, through compression. When diesel enters a gasoline engine, it fouls spark plugs, disrupts the air-fuel mixture, and can damage injectors, fuel lines, pumps, and filters. Drivers may experience sputtering, power loss, stalling, and in worst cases, complete engine failure. The complaint notes that repair costs can run from several hundred to several thousand dollars per vehicle. For someone who drove their car with a contaminated tank, the damage is compounded with each mile driven.
Is this lawsuit legitimate, and does it have a strong case?
▼
The complaint is grounded in well-documented facts: state regulators confirmed contamination at multiple locations, Sinclair provided a list of 46 affected stations, and over 600 consumer complaints were filed within days. The legal claims include negligence, breach of implied warranty, violations of the Colorado Consumer Protection Act, and unjust enrichment. Each claim is tied to conduct that is either admitted (the contamination happened) or well-evidenced (Defendants failed to detect or disclose it in time). The class action structure is appropriate because the harm was widespread, uniform, and caused by the same distribution failure. The case appears to be on solid legal ground.
Why couldn’t consumers just refuse to pump contaminated fuel?
▼
They had no way to know. Diesel contamination is not visible or detectable at a standard fuel pump. The pump displayed unleaded gasoline; the price was the regular gasoline price; the nozzle fit the fill neck. Consumers had every reasonable expectation that what they were buying was what was advertised. The complaint is explicit on this point: individual consumers lack the ability to detect fuel contamination at the point of sale. This is precisely why fuel quality control is the legal and ethical responsibility of distributors and retailers, not the public.
Who is named in this lawsuit and who else might be added?
▼
The current defendants are Dillon Companies, LLC (operating as King Soopers, King Soopers Fuel Center, and City Market) and HF Sinclair Corporation. The complaint explicitly anticipates adding Circle K, Safeway, Costco, Murphy Express, and other retailers as additional defendants after further investigation and discovery. Reports confirm that Costco stations in Sheridan and Superior, Colorado, and multiple Sinclair locations, also received contaminated fuel. The class will likely expand significantly as the case proceeds.
What are Defendants accused of under the Colorado Consumer Protection Act?
▼
The Colorado Consumer Protection Act prohibits deceptive trade practices, including misrepresenting the characteristics and quality of goods and failing to disclose material information that would influence a consumer’s purchase decision. The complaint alleges Defendants violated all three by selling diesel-contaminated fuel as unleaded gasoline, representing that the fuel met a standard it did not meet, and failing to disclose known contamination before or during the sale. If the court finds these violations were willful, Colorado law allows for treble damages, meaning Defendants could owe three times the actual harm caused to each class member.
What can I do to prevent this from happening again?
▼
If you were affected, contact an attorney to understand your rights to join the class action. File a complaint with the Colorado Division of Oil and Public Safety at ops.colorado.gov if you have not already. Document all expenses: repair bills, towing receipts, rental car costs, and missed work. Beyond your individual case, you can contact your Colorado state legislators and demand stronger mandatory real-time fuel quality testing requirements at distribution terminals. Support organizations that advocate for consumer protection legislation. Corporate negligence of this scale continues because the cost of a settlement is often less than the cost of investing in proper safety infrastructure. That calculation only changes when accountability is real and consistent.
Does this contamination event reveal a broader problem in fuel distribution?
▼
Yes. The complaint describes a system in which 400,000 gallons of dangerously contaminated fuel moved from terminal to truck to retailer to pump to consumer’s tank, with no point of failure being caught before harm occurred. This is a supply chain designed around efficiency and cost, not safety verification. The fact that six separate retailers across Colorado received the same contaminated fuel from a single supplier’s terminal suggests that industry-wide quality control standards are insufficient, and that the burden of detecting contamination falls almost entirely on regulators after the fact, not on the companies profiting from the transaction.
The Colorado state government has a notice about this contamination too: https://ops.colorado.gov/news-article/division-of-oil-public-safety-confirms-reports-of-contaminated-fuel-across-the-metro
💡 Explore Corporate Misconduct by Category
Corporations harm people every day — from wage theft to pollution. Learn more by exploring key areas of injustice.
- 💀 Product Safety Violations — When companies risk lives for profit.
- 🌿 Environmental Violations — Pollution, ecological collapse, and unchecked greed.
- 💼 Labor Exploitation — Wage theft, worker abuse, and unsafe conditions.
- 🛡️ Data Breaches & Privacy Abuses — Misuse and mishandling of personal information.
- 💵 Financial Fraud & Corruption — Lies, scams, and executive impunity.
