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Why Caterpillar Stopped Making On-Highway Diesel Engines

Caterpillar built some of the most well-known diesel engines in the trucking industry.

From the early 3406 series to the C15, these engines earned a reputation for durability, rebuild-ability, and long service life.

But despite that reputation, Caterpillar exited the on-highway truck engine market in 2010.

So what actually happened?

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What Happened After Caterpillar Stopped Making Truck Engines (And What It Means for C15 Owners Today)

When Caterpillar stopped producing on-highway diesel engines in 2010, it didn’t mean those engines disappeared.

In fact, thousands of Caterpillar engines – especially the C15 – are still running today in fleets across the country.

So the real question isn’t just why Caterpillar left the market.

If you’re looking for a full breakdown of that decision, read Why Caterpillar Stopped Making On-Highway Diesel Engines to understand the emissions, engineering, and business factors behind it.

👉 It’s what that decision means for reliability, parts availability, and long-term ownership today.

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Class 7 vs. Class 8 Trucks: What’s the Difference?

When people talk about heavy-duty commercial trucks, the terms “Class 7” and “Class 8” get used constantly throughout the trucking industry.

The biggest difference comes down to:

  • weight capacity,
  • intended application,
  • drivetrain durability,
  • and overall operating demands.

While both classifications fall into the heavy-duty commercial truck category, Class 7 and Class 8 trucks are designed for very different workloads and operating environments.

Quick Takeaway:
Class 7 trucks are commonly used for regional and vocational applications, while Class 8 trucks are engineered for severe-duty hauling, long-distance transportation, and maximum payload capacity.

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Diesel Cylinder Head and Engine Rebuild Kit Bundle Sale

Cylinder Head and Rebuild Kit Bundle

Highway and Heavy Parts is excited to introduce our new diesel engine parts bundle sales promotion. It includes diesel cylinder heads and diesel engine add-ons for all major heavy-duty truck and equipment manufacturers. If you need a cylinder head for your Cummins, Caterpillar, Detroit Diesel, or other heavy-duty diesel engine, you can get everything you need to do the job right and save some money.

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The 2026 Truck Driver Shortage: What It Means for Fleets and Equipment Reliability

The U.S. trucking industry is firmly in the spotlight again in 2026—this time for the ongoing shortage of qualified drivers. While much of the conversation focuses on hiring, pay, and working conditions, the driver shortage has direct ripple effects on fleet operations, maintenance schedules, and demand for reliable replacement parts.

When trucks are pushed harder and maintenance windows shrink, the health of your diesel engine becomes even more important.

What’s Causing the Shortage?

Industry research estimates a gap of 60,000 drivers in 2024, with the shortage expected to climb toward 80,000+ drivers by 2026. Whether you run a small operation or a large fleet, fewer available drivers means more pressure to maximize uptime and reduce unplanned repairs.

Several Underlying Causes Include:

  • Aging Workforce: Many experienced truckers are nearing retirement age, and fewer young adults are entering the industry to replace them.
  • Demanding Lifestyle: Long hours, tight schedules, and extended time on the road make it difficult to attract new drivers. The lifestyle isn’t for everyone, and turnover remains high.
  • Compensation Concerns: While wages have increased in many regions, some drivers still feel pay doesn’t fully reflect the demands and responsibilities of the job. This has slowed recruitment and retention efforts across the country.
  • Training Barriers: Earning a CDL requires time and financial investment. For many potential drivers, the upfront cost becomes a barrier to entering the industry.
  • Cost of Diesel Engine Maintenance: Owner-operators face rising expenses – from insurance to diesel fuel to parts and repairs. For some, the increasing cost of maintaining a diesel engine makes staying in the industry difficult.

How the Driver Shortage Impacts Fleets and Diesel Maintenance

The shortage doesn’t just affect staffing – it directly affects how fleets run their equipment:

  • Increased Pressure on Existing Trucks: With fewer drivers available, fleets need every truck to stay operational. Trucks get pushed harder, and maintenance schedules become tighter or delayed.
  • Higher Cost of Downtime: When a truck is down, and there isn’t another driver waiting to take its place, productivity drops. Unplanned engine failure becomes even more costly in a workforce shortage environment.
  • Shift Toward Reliability Over Cost: Fleets are becoming less willing to gamble on low-quality parts. Instead, they look for durable, high-quality components that reduce the risk of repeat failures.
  • Urgency for Faster Repairs: With limited driver availability, downtime isn’t just a scheduling inconvenience—it’s a financial hit. Fleets depend heavily on suppliers who offer quick shipping, dependable stock, and accurate lead times.
  • Preventive Maintenance Gains Importance: Preventive maintenance is becoming a key strategy to offset risk. Replacing worn gaskets, bearings, and other engine internals before failure is more cost-effective than dealing with an unexpected breakdown.

Navigating the Road Ahead: Potential Solutions

While the driver shortage poses real challenges, there are promising steps being taken across the industry to attract and retain qualified drivers – and to support the fleets that depend on them.

  1. Improved Working Conditions: Many fleets are investing in better pay structures, improved benefits, safer equipment, and more predictable home-time schedules. These upgrades help reduce turnover and make driving a more sustainable long-term career.
  2. Apprenticeship & Training Programs: Streamlined CDL training, paid apprenticeships, and on-the-job mentorship are becoming more common. By reducing the upfront cost and complexity of obtaining a CDL, companies are opening the door for younger drivers who may not have considered trucking as a career.
  3. Government Incentives: Tax credits, grant-funded training programs, and federal/state workforce initiatives are helping offset training costs for new drivers. These incentives make it easier for recruits to enter the industry and for fleets to sponsor their growth.
  4. Affordable, Reliable Maintenance Options: One of the biggest barriers for owner-operators—and a major cost driver for fleets – is the rising price of equipment and repairs. Access to high-quality, affordable diesel engine components plays a critical role in keeping trucks on the road without overwhelming maintenance budgets.
  5. Remanufactured and Premium Aftermarket Engine Parts: We offer a cost-effective alternative to OEM components while still delivering dependable performance. For many fleets, these options help reduce repair costs, extend equipment life, and make the total cost of ownership more manageable – especially when every operational dollar counts.

Order from Highway and Heavy Parts Today

At Highway and Heavy Parts, we understand how the driver shortage changes the demands on your equipment. That’s why we focus on:

  • High-quality internal engine components that meet or exceed OEM specifications.
  • Fast, reliable shipping from multiple distribution centers.
  • Expert-level technical support to help diagnose issues and choose the right parts.
  • Stock availability to minimize downtime and keep trucks moving.
  • Warranty-backed parts for peace of mind in a high-pressure operating environment.

Guaranteed for fit and function, HHP parts have the right combination of quality and price with total support from our on-staff ASE-certified technicians. With specialized knowledge, quality products, fast shipping, and unbeatable customer service, HHP has you covered.

Call 844-304-7688 or visit highwayandheavyparts.com to place your order today.

From diagnosis through delivery, we’re Highway and Heavy Parts.

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Dinex Emission: The Solution to Diesel Pollution

Dinex Emission is a company that has been dedicated to helping diesel operators meet the high standards of the EPA for a very long time. Though the EPA’s goal is to reduce the emissions of dangerous gasses into the air, their restrictions can often make transporting goods, completing construction projects, and harvesting large crops more difficult. As an expert in the field of diesel emissions control, Dinex has long been the solution to this obstacle.

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Increase Profits With Remanufactured Diesel Fuel Pumps from HHP!

When your engine is down, we know you want to get it back up and running as soon as possible. Highway & Heavy Parts has you covered! We’ve got the best quality parts at the best prices to get your engine performing like it should, saving you time and money!

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About the Bosch Mack E7 Diesel Engine Unit Pump System

We only carry parts from quality, reputable suppliers, to ensure you’re getting the best! That’s why we’re proud to carry Genuine Bosch components, like this unit pump system for the Mack E7. 

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Differences Between the DD15/DD16 and Series 50/Series 60 Diesel Fuel Injectors

Diesel Common Rail Fuel Injection Systems are becoming more and more popular in heavy-duty diesel applications. We get a lot of questions about the differences between the common rail system and the older EUI mechanical injection system. 

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