2027 Engine Regulations on the Horizon
The passage of time is slow but inexorable; though this article is being written in March 2026, eventually we will reach 2027 and the engine regulations that have been touted for years will come into play. Here is what you need to know.
Not the NOx!
The biggest change to engine regulations is the allowable amount of nitrous oxide (NOx) emissions per horsepower-hour. Starting with 1994 for our baseline, the allowable amount was 5 grams per horse-power hour (g/HPh), and the update before 2027, 2010, had it set to 0.2 g/HPh. By 2027 the amount will become 0.035 g/HPh, a decrease of 99.3% since 1994 and an 82.5% decrease since 2010.
While the Trump Administration has taken a much more relaxed approach to market regulations, the Environmental Protection Agency (EPA) is currently still set to have this NOx requirement become official regulation, though Trump’s EPA has sent an intentionally vague message saying they were looking into it:
“EPA is working on reevaluating the 2022 Heavy-Duty Engine and Vehicle NOx rule, and is planning to propose a rule in the spring of 2026. If finalized, the action will make major changes to the program requirements while maintaining the Model Year 2027 start of the standards, which can significantly reduce the cost of new heavy-duty vehicles, while still protecting human health and the environment, and avoiding regulatory distortions of the heavy-duty vehicle market.”
Warranting a Warranty
The other major change coming down the pipeline is a rollback of emissions equipment warranties, such as for diesel exhaust fluid systems. Previously, they were required to run for 650,000 miles or have the manufacturer cover any normal wear and tear on the systems until it hit 650,000. This payment coverage resulted in higher prices of an estimated $30,000 per truck, frontloading the cost of maintenance to the buyer and being recouped later. Now, the Trump Administration is reducing it to 435,000 miles, which will likely cause a drop in the price of trucks as companies can hedge fewer bets on the equipment expiring before reaching its required mileage.
Conclusion
When it comes to trucking industry regulations, there is usually a “grandfather” system, meaning trucks from before 2027 will be allowed to be driven on the road until they wear out, even if their NOx emissions are higher than the EPA would like. That means if you want to avoid costly state-of-the-art NOx remission reduction systems in your new truck, you may want to buy now. If you do, you can count on TopMark Funding.
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