The 2021 Kenworth T300 is a versatile medium-duty truck known for its ruggedness and adaptability. Produced over several model years, it typically features a conventional cab body style. While specific trims can vary, its popularity stems from its reputation for reliability and cost-effectiveness in various vocational applications. Pricing for a new 2021 model would have been in the competitive range for its class, generally starting above $70,000 and going higher depending on configuration.
The Good
The 2021 Kenworth T300 offers robust performance and exceptional reliability, built to withstand demanding work. Its comfortable cab provides a productive environment for drivers, while its efficient operation translates to lower running costs, appealing to the practical operator. Its enduring design speaks to a legacy of toughness that resonates emotionally with those who value dependable workhorses.
The Bad
While generally robust, potential buyers of a 2021 Kenworth T300 should be aware of possible areas like the aging interior design compared to newer competitors, and the need for consistent maintenance to prevent wear and tear on powertrain components. Some owners report occasional electronic glitches.
2021 Kenworth T300: Quick Overview
- Engine Options: The 2021 Kenworth T300 typically offered a range of reliable PACCAR PX-7 engines. These are known for their durability and suitability for medium-duty applications. Exact engine configurations and displacements could vary based on vocational needs and customer specifications.
- Horsepower: Horsepower for the PACCAR PX-7 engines in the T300 generally ranged from approximately 220 hp to 325 hp. This range provided ample power for various hauling and vocational tasks.
- Fuel Economy: Specific MPG figures for commercial trucks like the T300 are highly variable and depend heavily on load, terrain, driving style, and the specific engine and transmission installed. However, the PACCAR PX-7 is designed with a focus on efficiency for its class, aiming to provide competitive fuel economy for its operational duties.
- 0-60 Times: 0-60 mph acceleration is not a primary performance metric for commercial trucks, and such data is rarely published or relevant for the T300's intended use. Its focus is on torque and sustained power delivery for work, not rapid acceleration.
- Towing Capacity: The towing capacity of a 2021 Kenworth T300 is highly dependent on its specific configuration, including the chassis, rear axle ratio, and any auxiliary equipment fitted. It is designed for medium-duty towing and hauling, with capacities typically ranging from 10,000 lbs to 30,000 lbs Gross Combined Weight Rating (GCWR) or more, suitable for towing trailers or carrying significant payloads.
- Trim-Level Features: The T300 was often configured for specific vocational uses rather than distinct 'trims' in the passenger car sense. However, standard features would include a durable chassis, a conventional cab designed for driver visibility and comfort, power steering, and essential safety features. Optional features could include upgraded interior amenities, different seating options, advanced climate control, air brakes, and specialized body upfits like dump beds, service bodies, or box configurations.
2021 Kenworth T300 Specifications
Vehicle Information
| Year | 2021 |
| Make | Kenworth |
| Model | T300 |
| Trim | - |
| Style | - |
| Type | Truck |
| Category | Heavy Truck |
Manufacturing Details
| Made In | Mexico |
| Manufacturing City | MEXICALI |
Dimensions
| Doors | - |
| Curb Weight | - |
| Gross Vehicle Weight Rating | 33001 pounds |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 6.7L I6 |
| Engine Size | 6.7L |
| Engine Cylinders | 8 |
| Transmission | - |
| Transmission Type | - |
| Transmission Speeds | - |
| Drivetrain | Rear-Wheel Drive |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
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What Problems Does the 2021 Kenworth T300 Have?
The 2021 Kenworth T300, being part of a long-standing and reputable lineage, generally exhibits strong reliability. However, like any commercial vehicle, specific issues can arise, often related to the intense operational demands placed upon them. Frequently reported concerns, though not necessarily widespread, can include issues with the exhaust after-treatment systems (DPF regeneration problems, sensor failures) as emissions regulations become more stringent and complex. Some owners have reported occasional electrical gremlins, such as intermittent warning lights or issues with dashboard components, though these are often resolved with software updates or minor repairs. The cooling system, particularly hoses and the radiator, can be a point of attention over time due to constant thermal cycling and vibration. While the PACCAR PX-7 engine is robust, diligent maintenance is key; neglect can lead to issues like turbocharger wear or fuel injector problems. Specific to the 2021 model year, or within a few years preceding it, there might be recalls related to specific electronic control units (ECUs) or braking system components that are part of standard manufacturer safety campaigns. It's always recommended to check for any outstanding recalls with the manufacturer or a dealership for the specific VIN. Long-term reliability is heavily contingent on how the vehicle is used and maintained. A T300 used for light-duty delivery in urban environments will likely experience fewer severe issues than one consistently hauling heavy loads over rugged terrain. Over-reliance on the vehicle without proper preventative maintenance can accelerate wear on driveline components, suspension, and brakes.
How long will the 2021 Kenworth T300 last?
The 2021 Kenworth T300 is built for longevity, with many units expected to achieve well over 300,000 miles and often exceeding 500,000 miles in vocational service with proper care. Owner data and typical maintenance schedules suggest a service life of 10 to 15 years is achievable, assuming regular oil changes, filter replacements, and attention to wear items. The long-term durability is a hallmark of Kenworth engineering, particularly in the chassis and powertrain. Weaknesses that might emerge over extended use often relate to the cumulative effects of vibration and stress: suspension components can wear, body panels might show corrosion if not protected, and complex electronic systems, while generally reliable, can eventually develop faults. However, the core mechanicals are designed for high mileage and resilience.
What Technology & Safety Features are Included?
The 2021 Kenworth T300 prioritizes functionality and driver focus over cutting-edge infotainment. Built-in technology typically revolves around essential operational displays and controls. Standard features usually include a driver information center providing critical vehicle data like fuel levels, engine status, and trip information. The entertainment system is generally basic, often consisting of an AM/FM radio with optional auxiliary input or Bluetooth connectivity for hands-free calling and audio streaming. More advanced infotainment systems, including touchscreens and navigation, were less common in standard T300 configurations but could be optioned or part of specialized upfits.
Driver-assistance features on the 2021 T300 were less prevalent than in modern passenger vehicles. While anti-lock braking systems (ABS) were standard for safety, advanced features like lane departure warning, adaptive cruise control, or automatic emergency braking were typically not integrated into this model. The focus was on robust mechanical systems and excellent driver visibility from the conventional cab design.
Safety features were centered on passive systems and the structural integrity of the cab. This includes seat belts, an impact-absorbing steering column, and a robust frame designed to protect occupants in the event of a collision. Air brakes were a common and crucial safety component, providing significant stopping power.
Crash-test ratings for commercial trucks like the Kenworth T300 are not typically conducted or published in the same manner as passenger cars by organizations like the NHTSA or IIHS. The safety design of these vehicles is governed by stringent federal motor vehicle safety standards (FMVSS) specifically applicable to heavy-duty trucks. While specific crash data isn't readily available, Kenworth trucks are engineered to meet or exceed these rigorous safety requirements for commercial applications.
Driver-assistance features on the 2021 T300 were less prevalent than in modern passenger vehicles. While anti-lock braking systems (ABS) were standard for safety, advanced features like lane departure warning, adaptive cruise control, or automatic emergency braking were typically not integrated into this model. The focus was on robust mechanical systems and excellent driver visibility from the conventional cab design.
Safety features were centered on passive systems and the structural integrity of the cab. This includes seat belts, an impact-absorbing steering column, and a robust frame designed to protect occupants in the event of a collision. Air brakes were a common and crucial safety component, providing significant stopping power.
Crash-test ratings for commercial trucks like the Kenworth T300 are not typically conducted or published in the same manner as passenger cars by organizations like the NHTSA or IIHS. The safety design of these vehicles is governed by stringent federal motor vehicle safety standards (FMVSS) specifically applicable to heavy-duty trucks. While specific crash data isn't readily available, Kenworth trucks are engineered to meet or exceed these rigorous safety requirements for commercial applications.
What Colors Options are Available?
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2021 Kenworth T300 Prices and Market Value
When new, the 2021 Kenworth T300 would have started in the mid-$70,000 range and could easily climb to over $100,000 depending on engine, transmission, chassis, and body upfits. On the used market in 2024, prices for a 2021 Kenworth T300 can range significantly, typically from $50,000 to $90,000 or more. Depreciation for commercial trucks is often less steep than for light-duty vehicles, especially for well-maintained and popular vocational models. Key factors affecting resale value include mileage, overall condition, maintenance history, tire wear, the type and condition of any vocational bodywork (e.g., dump bed, service body), and current market demand for specific configurations. A truck with lower mileage and a clean service record will command a premium.
2021 Kenworth T300 Cost of Ownership
Ownership costs for a 2021 Kenworth T300 can be substantial but are often justified by its work capabilities. Insurance premiums will be higher than for a light-duty vehicle, reflecting its commercial use, value, and potential risk. Fuel costs are a significant ongoing expense, though the PACCAR PX-7 engine aims for efficiency within its class; actual costs vary greatly with mileage and fuel prices. Regular maintenance is crucial and represents a considerable part of the budget, including oil changes, filter replacements, and potential repairs to specialized vocational equipment. Repair costs can be high for major engine or transmission work. Overall, the T300 is designed for durability, making it moderately costly to own, but its long service life and robust performance often provide good value for businesses.
2021 Kenworth T300 Fuel Efficiency
Fuel Type
Diesel
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
2021 Kenworth T300 Warranty
Basic
Original warranty
0 months / No data
Estimated remaining
Expired
Powertrain
Original warranty
0 months / No data
Estimated remaining
Expired
Rust
Original warranty
0 months / No data
Estimated remaining
Expired
2021 Kenworth T300 Insurance
Insurance for a 2021 Kenworth T300 is moderately priced, reflecting its status as a Truck with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2021 Kenworth T300 Compare to Other Truck?
The 2021 Kenworth T300 competes in the medium-duty conventional truck segment, where it faces strong rivals such as the Freightliner M2 106, International MV Series, and Peterbilt 220.
Performance: The T300, powered by the PACCAR PX-7, offers competitive performance with reliable torque for vocational tasks. It generally matches or exceeds the hauling capabilities of its direct competitors, providing a solid workhorse for various applications. The Freightliner M2 106 is also known for its strong performance and a wide range of powertrain options.
Features: In terms of features, the T300 tends to focus on practical functionality over advanced technology. While its cab is comfortable and ergonomic for a work truck, competitors like the Freightliner M2 106 might offer slightly more modern interior options and potentially more integrated driver-assistance technologies, depending on the specific configurations chosen. The Peterbilt 220 often appeals to those seeking a more premium feel and heritage.
Reliability: Kenworth has a long-standing reputation for building durable and reliable trucks, and the T300 is no exception. It is often perceived as being exceptionally robust. The International MV series, while a strong contender, has historically had a more mixed perception regarding long-term reliability compared to Kenworth or Freightliner, though significant improvements have been made.
Price: Pricing is highly competitive across this segment. The T300 typically sits in a similar price bracket to its direct rivals. When new, configurations can push prices well into the six-figure range. Used prices will reflect the strong residual values associated with well-built commercial trucks.
Recommendations:
If outstanding durability and a reputation for ruggedness are paramount, the Kenworth T300 is an excellent choice.
For a slightly more modern feel and potentially wider array of option packages, the Freightliner M2 106 is a very strong and popular alternative.
The Peterbilt 220 offers a compelling option for those who value the Peterbilt brand and its associated design cues, often providing a refined operator experience.
The International MV Series can be a good value, particularly if found at a competitive price point, but careful inspection and research into specific configurations are advised.
Performance: The T300, powered by the PACCAR PX-7, offers competitive performance with reliable torque for vocational tasks. It generally matches or exceeds the hauling capabilities of its direct competitors, providing a solid workhorse for various applications. The Freightliner M2 106 is also known for its strong performance and a wide range of powertrain options.
Features: In terms of features, the T300 tends to focus on practical functionality over advanced technology. While its cab is comfortable and ergonomic for a work truck, competitors like the Freightliner M2 106 might offer slightly more modern interior options and potentially more integrated driver-assistance technologies, depending on the specific configurations chosen. The Peterbilt 220 often appeals to those seeking a more premium feel and heritage.
Reliability: Kenworth has a long-standing reputation for building durable and reliable trucks, and the T300 is no exception. It is often perceived as being exceptionally robust. The International MV series, while a strong contender, has historically had a more mixed perception regarding long-term reliability compared to Kenworth or Freightliner, though significant improvements have been made.
Price: Pricing is highly competitive across this segment. The T300 typically sits in a similar price bracket to its direct rivals. When new, configurations can push prices well into the six-figure range. Used prices will reflect the strong residual values associated with well-built commercial trucks.
Recommendations:
If outstanding durability and a reputation for ruggedness are paramount, the Kenworth T300 is an excellent choice.
For a slightly more modern feel and potentially wider array of option packages, the Freightliner M2 106 is a very strong and popular alternative.
The Peterbilt 220 offers a compelling option for those who value the Peterbilt brand and its associated design cues, often providing a refined operator experience.
The International MV Series can be a good value, particularly if found at a competitive price point, but careful inspection and research into specific configurations are advised.
Final Verdict: Is the 2021 Kenworth T300 a Good Truck?
The 2021 Kenworth T300 is an ideal vehicle for businesses and owner-operators who prioritize ruggedness, reliability, and proven durability for vocational applications such as construction, delivery, towing, and utility work. It is certainly worth buying for those who need a no-nonsense workhorse designed to withstand demanding daily use.
For a new purchase, it offers a blend of capability and Kenworth's legendary build quality. However, considering its price point, many buyers might find excellent value in the used market. A well-maintained used 2021 T300, especially one with lower mileage and a clear service history, can represent a significant cost saving while still offering many years of dependable service. When buying used, focus on the condition of the powertrain, chassis, and any specific vocational upfits to ensure it meets your operational needs. Specific trims are less relevant than the overall configuration and spec for the intended application.
For a new purchase, it offers a blend of capability and Kenworth's legendary build quality. However, considering its price point, many buyers might find excellent value in the used market. A well-maintained used 2021 T300, especially one with lower mileage and a clear service history, can represent a significant cost saving while still offering many years of dependable service. When buying used, focus on the condition of the powertrain, chassis, and any specific vocational upfits to ensure it meets your operational needs. Specific trims are less relevant than the overall configuration and spec for the intended application.
Eugene S
Eugene is an automotive enthusiast with over 15 years of experience in the used car market. As a writer at VINCheck.info, he brings deep industry insight and a passion for cars, helping readers make smart, informed decisions. Eugene has written hundreds of used car reviews and is known for breaking down complex automotive topics into clear, actionable advice. Over the years, he has driven and worked on a wide range of vehicles—starting with tuning street cars in his early days and eventually focusing on performance upgrades and reliability improvements. Today, he specializes in evaluating used vehicles through the lens of real-world ownership and enthusiast needs. A longtime fan of Porsche, Eugene especially appreciates vehicles that blend durability with driving enjoyment.