What To Look For When Buying A Diesel?

  • Check the coolant overflow reservoir/degas bottle for white residue (indicative of a blown head gasket).
  • Check for worn ball joints, excessive rust, and leaks in the fuel, coolant, or transmission fluid.
  • If you can’t understand the code yourself, don’t accept any explanation for why the Check Engine Light (CEL) is on.
  • At idle and when in gear, listen for any form of lope or miss (could be the sign of an injector issue). Consider it a worst-case scenario and walk away if you hear any disturbing noises.
  • After selecting a gear, pay attention to how long it takes for an automatic transmission to engage.

What should I look for when buying a diesel engine?

Is buying a used diesel automobile different from buying a used car in general? When seeking to buy a used diesel vehicle, there are a few things to consider.

A diesel engine burns diesel in a somewhat different way than a gasoline engine. Because diesel fuel is much heavier than gasoline, it produces a little amount of black soot in the exhaust. Examine the exhaust to see if the car has accumulated an excessive amount of soot. If this is the case, there is an issue with the combustion of the engine or with the exhaust itself.

The diesel used in automobiles oil is a major indicator of whether or not something is incorrect. Examine the dipstick to determine the color of the oil. If the stick has a small amount of white or a milky substance on it, keep walking until you find another vehicle. This indicates that the engine has internal difficulties and will need to be replaced. You can also check underneath the car to see if any oil is leaking. Another symptom of a problem is a quick inspection around the engine compartment for telltale signs of oil around the gaskets.

One of the most prevalent issues with diesel used cars is that they are notoriously difficult to start in the cold. Because diesel fuel is heavier than standard gasoline, it will thicken and become more difficult to pass through the lines when it is extremely cold. To examine how the car cranks over from a cold start, try starting it from the ground up. If it takes a long time, it means that some of the glow plugs in the head are malfunctioning. These can be replaced, but they are costly.

The fluid in the radiator should be clean and free of debris. If you see that the coolant is not a uniform color, has streaks in it, or is lumpy with crud and oil, you should keep looking for another car.

When the automobile is operating, you can observe what type of exhaust it produces. A light black hue is preferable, but if it is too thick or white, there is an issue with the engine. It’s possible that the fuel/air ratio is wrong, but the cylinders may need to be bored or replaced.

Take a test drive in the used diesel to see how it behaves. Also, keep an eye out for any excessive smoke, especially if you’re beginning from a standstill. Feel for any vibrations, as well as how the steering works and any power lags.

What to know about a diesel before buying one?

Consider all of the industries in our country that rely on diesel engines to get the job done. Every semi-truck on the road today is powered by a diesel engine. And cargo ships are usually powered by a pair (or more) of massive diesel engines that turn the propellers. Almost every vehicle used on a construction site is powered by a diesel engine. They’re everywhere in places where work has to be done consistently day after day.

What should I look for when buying a high mileage diesel?

Because diesel pickup trucks have more durable engines that can sustain greater compression ratios, they often obtain better economy than gas trucks. Powerstroke, Cummins, and Duramax diesel vehicles often last well beyond 100,000 miles, even when used frequently for towing and hauling. As a result, diesel pickups with 200,000 or even 300,000 kilometers sometimes attract high resale values on the secondhand truck market. Drivers shopping for a used diesel pickup understand that a truck’s life isn’t over just because it has a lot of miles on it.

With modern trucks surviving longer than ever before, it’s not uncommon to come across gas trucks with 200,000-mile lifespans. Diesel trucks, on the other hand, can exceed that limit. Diesel pickup trucks may easily last 500,000 miles or more. It isn’t simply their engines that are more durable. Because diesel engines are heavier than gas engines, diesel vehicle hulls are designed and constructed to be more durable.

Not all high-mileage diesel trucks are created equal, much like other cars. For example, a diesel truck that has been used extensively for towing and transporting large loads for 100,000 miles may require serious repairs, whereas a diesel pickup that has been rarely used and has 200,000 miles on the clock may still have years of trouble-free life ahead of it. However, it’s also crucial to know that the life expectancy of a diesel vehicle is determined by a variety of other elements outside the odometer reading, such as:

For example, a 200,000-mile diesel pickup with only one or two owners and strong maintenance records is likely to be a better investment than a 100,000-mile vehicle with four owners and few records.

The general condition and appearance of the truck are also significant. A truck with a well-kept exterior and interior is likely to have had its mechanical components well-kept as well.

Duramax is a brand of diesel engine found in GMC and Chevy vehicles manufactured by General Motors. What constitutes excessive mileage for these engines is a matter of debate. Some owners consider 100,000 miles to be excessive mileage for Chevy diesel trucks, while others believe that anything less than 350,000 should be considered high mileage. A poorly maintained engine might swiftly deteriorate before reaching 100,000 miles, whereas a well-kept Duramax pickup truck should last 400,000 to 500,000 miles.

Cummins engines can be found in Dodge diesel trucks and Ram diesel trucks. Cummins diesel engines, like the Duramax, are designed to last a long time. On a Cummins diesel, 350,000 to 500,000 kilometers is normally considered high mileage. Of course, this is dependent on how well the engine is maintained.

Although maintaining the engine is crucial, some diesel pickup drivers believe it is even more important to keep the truck alive around the engine because the truck itself is less likely to last more than 500,000 miles, even if the diesel engine is well-maintained.

The Powerstroke engine, like the Duramax and Cummins engines, is found in Ford trucks and can last up to 500,000 kilometers. However, similar with the Duramax and Cummins engines, a Powerstroke engine with 350,000 to 500,000 miles on the clock is considered high mileage. The key to gaining the most miles is to keep the truck and engine in good shape. Ford vehicles are the most popular truck brand in the United States, and they’re regarded for their overall dependability.

Purchasing a diesel pickup truck with at least 250,000 kilometers could be a good deal. Diesel pickups are more expensive than their gasoline counterparts when new, so buying one used might save you a lot of money. When purchasing a used diesel truck, keep the following in mind:

Oil leaks are common in high-mileage engines, but they aren’t always cause for concern. It’s not uncommon to have small leaks around gaskets and seals. A little oil seepage around the front and rear main seals, for example, isn’t all that concerning and is even expected. Oil that is more densely coated around a seal or gasket, on the other hand, may raise suspicion. It depends on how much oil is smeared across the surface. To put it another way, while having no oil leak is definitely better, a tiny oil leak on a high-mileage diesel engine shouldn’t necessarily be a deal breaker.

When purchasing an older diesel truck with a mechanical injection system, it’s a good idea to start a diesel fuel additive routine. Long-term running without supplemental lubrication of one of these older diesel engines can result in early injection pump failure. A fuel additive, on the other hand, can improve modern diesel engines. Additives can help any diesel engine, whether it’s a high-mileage or not, get better gas mileage.

Distinct trucks and engines, like any other vehicle, have different challenges. Buying an engine model that appears to have the fewest difficulties may be irrelevant if the truck it’s in has issues. It’s also crucial to look into the individual truck’s troubles, in addition to the engine’s concerns. Maintenance records can be extremely useful in this situation.

For example, the water pump on a particular truck may fail every 100,000 miles or so. Even if a truck has 300,000 miles on it, if the water pump hasn’t been updated in 150,000 miles, you could be looking at expensive repairs.

On a high-mileage diesel truck, it’s never too late to switch to synthetic engine and gear oil. The following are some of the advantages of synthetic oil:

Heat, repetitive mechanical pressures, and chemical breakdown from fuel dilution are the major enemies of oil stability. All of these forces are more prone to higher-mileage engines. Synthetic oil can help a high-mileage diesel engine last longer and run more efficiently.

Synthetic oils, in the end, minimize friction better than traditional lubricants. Friction can increase as diesel parts wear out in high-mileage engines. More friction equals more heat, which accelerates the deterioration of oil and diesel truck parts.

To summarize, there is no single number that defines what constitutes high mileage for a diesel pickup truck; however, anything beyond 500,000 is commonly considered excessive mileage. However, remember that there are many more factors to consider when purchasing a used diesel pickup than mileage. A well-maintained, high-mileage Powerstroke, Cummins, or Duramax diesel pickup truck is almost always a better option than a poorly-maintained, heavily-used diesel pickup truck with lower mileage.

What is high mileage on a diesel truck?

When it comes to mileage, according to Prosource Diesel, diesel vehicles frequently receive better mileage than gas trucks since their engines are more durable. As a result, according to Prosource Diesel, it’s not uncommon to find a used diesel truck with more than 200,000 kilometers on the odometer. There’s a good chance you’ll stumble across a used diesel vehicle with 300,000 miles on the clock.

What constitutes excessive mileage in the case of specific diesel engines? According to Prosource Diesel, a secondhand diesel truck with a Cummins or Duramax engine with more than 350,000 kilometers is considered excessive mileage. For a Powerstroke diesel engine, anything above 350,000 miles is considered high mileage.

How many miles should a diesel engine last?

Your car’s gasoline engine should last roughly 200,000 miles before it requires a major maintenance or you need to purchase a new vehicle. Diesel engines, on the other hand, may run for 1,000,000-1,500,000 miles without having any serious maintenance. In fact, a well-maintained diesel engine can last for 30 years or more on the road.

According to Capital Reman Exchange, there are three key factors for a diesel engine’s lifetime, endurance, and reliability:

A diesel engine is gear-driven in design. Gears, unlike other parts that might be broken or damaged, are easy to repair and never lose their timing. Gear-driven water and oil pumps are available on most diesel automobiles. Parts and components are less likely to fail as a result of this.

Diesel-powered vehicles are typically built with heavy-duty components that can withstand the vehicle’s power, resulting in less wear and tear on all parts of the engine.

Diesel engines are also fantastic since they are self-cooling, which means they have a far lower possibility of overheating. There are multiple sensors and thermostats in use, which means that if one fails, the engine will not overheat. A steady supply of coolant flows freely through the engine thanks to many piston-cooling nozzles.

Compression ignition is used by a diesel engine to use its fuel to power itself. This happens when diesel fuel and air are squeezed to the point that heat is generated, resulting in spontaneous combustion. This spontaneous combustion, according to Digital Trends, is significantly more favourable for a long-lasting engine.

Can you drive a diesel short distances?

This is also known as “diesel car city driving,” and it is something you should avoid. It’s common knowledge among petrolheads, but it’s always worthwhile to explain why.

Low-speed, short-distance driving easily clogs your Diesel Particulate Filter (DPF). If you have a high annual mileage (imagine 10,000+ miles per year) or mostly drive on highways, the effect will be significantly slower.

How long should a diesel pickup last?

Longer Life Expectancy A truck fuelled by gasoline can go 200,000 kilometers. A diesel vehicle, on the other hand, has a longer lifespan and may go between 500,000 and 800,000 kilometers.

How often should you drive a diesel truck?

Diesel is much more likely than gasoline to leave a build-up of combustion debris in the engine. When you purchased your diesel vehicle, you may have been instructed that it must be driven vast miles on a weekly basis (usually a 60-mile trip each week is recommended).

How many miles per gallon does a 6.6 Duramax diesel get?

The 2500 level of the 2021 Sierra HD series contains a diesel engine that produces 445 horsepower and 910 pound-feet of torque. On the freeway, this Duramax 6.6-liter V-8 scores 17 to 19 mpg.

Do diesels last longer?

Customers who drive a lot of highway miles prefer diesel engines, according to Bell Performance and Road and Track, because they are more efficient on these roads than gas engines. Diesel fuel simply has more energy per gallon than gasoline, making it more cost-effective overall. Diesel engines are still more fuel efficient than gasoline engines, but they are less so for city drivers. Diesel cars also have higher torque, which means they get better gas mileage and accelerate faster.

It’s crucial to keep in mind that some types of diesel fuel can reduce vehicle performance. Black diesel, biodiesel, and other improved diesel products are among them.

Diesel and gasoline are around the same price for most Americans. Diesel can sometimes be more expensive than gasoline, yet it can also be less expensive than gasoline. Even if you pay more on diesel fuel, a diesel engine will still provide better fuel efficiency throughout the life of the car. This is because an 8-liter gasoline engine would be required to produce the same level of power as a 6-liter diesel engine.

Diesel engines, according to Digital Trends, are more durable and endure longer than gas engines, with reliable operation and low maintenance requirements. Diesel cars used to be substantially heavier than comparable-sized gas cars, but thanks to contemporary manufacturing technologies, this is no longer an issue.

Diesel engines also have fewer components than gasoline engines, reducing the number of potential parts that could fail in your vehicle.

Diesel engines often require fewer repair and maintenance services than gasoline engines, resulting in a cost savings.

While early diesel engines had a well-deserved reputation for being noisy, current technology has largely addressed this issue. Noise pollution and dark smoke have been reduced, so if you were concerned about those issues in prior decades, you may wish to reconsider diesel as a viable option. Today, the driving experience in a diesel-powered vehicle is essentially identical to that of a gasoline-powered vehicle.