Should I be buying a diesel car?

Meghna Chakraborty
Est. Reading Time 7 mins

Rising petrol prices got you wanting to go back to diesel cars? If you’re deliberating between buying a petrol car or a diesel car, and wondering 'is it worth buying a diesel car in Australia?', the answer isn't that simple! The choice entirely depends upon your budget, your concerns and your personal preferences.

Are diesel cars still relevant in 2024? Well, yes. As per AADA’s report for 2023, 31.1% used cars sold in Australia were Diesel, while 65.0% were petrol. So, they haven’t become dinosaurs in this transitional word of hybrids and EVs, at least yet?

However, should you even invest in diesel cars? To help you through this diesel dilemma, we’ve curated a list of the pros and cons of buying a diesel car that should make this decision easy for you.

Is a diesel car right for me?

A debate as old as its engine, is owning a diesel car is the right choice for me, is a rather subjective question with a very nuanced answer. Car owners can benefit from owning a diesel car, provided you and your car have diesel needs! Certain car owners in Australia, especially those who travel long distances or have high annual mileage, can benefit greatly from choosing diesel cars. Here's why:

  • With Diesel engines, you get more bang for your buck. You can travel farther on each tank, meaning fewer stops and potentially lower fuel costs overall, especially on long hauls.
  • Diesel's muscle makes light work of hauling heavy loads. This is especially beneficial if you own a trailer or caravan, essentially any car you can use for towing.
  • Diesel's extended range is advantageous for those living far from fuel stations.
  • While diesel cars may have a higher upfront cost compared to petrol, the long-term savings from their efficiency and durability can be significant. Moreover, modern diesel engines are just as clean as their petrol counterparts, thanks to cleaner fuels and improved emission control technology.

But, as the world moves towards sustainability, Australia's going green, so consider the environment too. If that is a matter of concern for you, you should explore hybrid or electric options for an even more environment-friendly ride.

Diesel's a great choice for high-mileage Aussies, but for the planet's sake, keep future options in mind!

Advancements in diesel technology

Diesel is globally renowned as the top-performing internal combustion engine, surpassing its counterparts such as gasoline, compressed natural gas, and liquefied natural gas in energy density, power, and fuel efficiency.

The fuel efficiency of advanced diesel is unparalleled, thanks to the energy-rich properties of diesel fuel and the completeness of combustion, which generates more useful mechanical energy compared to other fuels. Ultra-low sulfur diesel fuel (ULSD) is at the forefront, offering the highest energy density among transportation fuels and surpassing even gasoline in energy content. Additionally, advanced renewable low-carbon biodiesel fuels further enhance the environmental benefits of diesel technology, reducing greenhouse gas and other emissions by up to 80% compared to conventional petroleum diesel.

With ULSD becoming the standard diesel fuel worldwide and the integration of advanced biodiesel fuels, diesel technology continues to pave the way towards a cleaner, more sustainable future for transportation.

Pros of owning a diesel car

Listed below are some of the pros of owning a diesel car:

1.Fuel efficient:

Diesel leads the charge in efficiency, surpassing petrol engines with their reduced fuel consumption and lower CO2 emissions, making them the environmentally conscious choice. Petrol-powered engines typically operate at an efficiency of around 20%, meaning only 20% of the fuel consumed is utilised to move the vehicle. The remaining 80% is lost to friction, noise, engine functions, and exhaust.

In contrast, diesel-powered engines are significantly more efficient, achieving efficiencies of 40% or higher. This means they can extract more energy from the fuel compared to gasoline engines, resulting in better fuel economy and reduced fuel consumption.

2. Produces more torque:

Diesel engines are kings in pulling power,  enjoying higher torque compared to their petrol counterparts. This formidable strength makes them the ideal choice for towing heavy loads or comfortably accommodating a full complement of seven passengers.

Diesel cars have higher torque compared to petrol cars. This is because diesel engines are designed to prioritise torque over horsepower, making them well-suited for tasks requiring heavy loads to be moved efficiently. In contrast, petrol engines tend to prioritise horsepower, which results in a fast-revving characteristic favoured by enthusiasts.

3.  Excellent mileage:

With their unparalleled fuel economy, diesel engines redefine the concept of long-distance travel. One tank of diesel can propel you double the distance of a petrol tank, providing unparalleled efficiency and reducing the frequency of trips to refuel.

Diesel cars often reach 200,000 miles before needing major repairs, twice the mileage of gas engines, before they potentially start requiring frequent maintenance.

4. Subject to lesser price fluctuations:

Diesel fuel tends to remain stable amidst the turbulence of fluctuating fuel prices. Unlike petrol, diesel prices remain relatively steady, providing consumers with assurance and financial predictability.

Diesel prices in Australia's major cities, including Sydney, Melbourne, Brisbane, Adelaide, and Perth, continued to drop throughout the June quarter of 2023. These stable and decreasing diesel prices indicate that diesel cars are a sound investment, as they are less prone to fluctuations and offer cost-effective fuel options.

5. Surprisingly economical:

Surprisingly, certain diesel engines outshine even hybrid alternatives in terms of both fuel efficiency and upfront cost. This economic advantage positions diesel-powered vehicles as an attractive and accessible option for budget-conscious consumers.

6. Durable:

Engineered to endure the rigours of high compression ratios, diesel engines boast exceptional longevity. Setting records in endurance, vehicles such as those from Mercedes-Benz have clocked over 900,000 miles on their original engines, solidifying diesel's reputation as the epitome of endurance and resilience.

7. Simple:

Diesel engines embrace a philosophy of simplicity, boasting fewer components and eliminating the need for frequent tuning or spark plug replacements. This streamlined design ensures reliability and ease of maintenance, further enhancing the appeal of diesel-powered vehicles.

8. Great on highways:

Diesel engines excel on the open road, effortlessly overtaking other vehicles and cruising smoothly. They require fewer gear changes, making highway driving as easy as it gets, and ensuring a comfortable journey.

Cons of owning a diesel car

Listed below are some of the cons of owning a diesel car:

1.Higher fuel costs:

Despite diesel engines' efficiency, regular unleaded fuel is generally cheaper at the pump compared to diesel. In comparison to petrol, diesel prices often come with a premium, which can dent the wallet of diesel car owners. Prices can vary in accordance with the city, so you may want to refer to that as well.

2. Initial cost:

Diesel models tend to command a higher price tag, typically ranging from 10-15% more expensive than their petrol counterparts. For example, a popular diesel car might have a higher starting price compared to its petrol version. For instance, MAZDA CX-8 Touring, which is a petrol variant costs about $54,602, but its diesel counterpart MAZDA CX-8 Touring- Active costs about $61,581.

3. Long-term cost considerations:

While diesel cars may promise fuel efficiency, potential buyers should carefully calculate the duration it takes to recoup the initial investment, factoring in diesel prices and anticipated mileage. This consideration is crucial for determining the economic viability of owning a diesel car over time.

4. Maintenance expenses:

Diesel engines often come with higher service costs, particularly regarding fuel system components. These parts can be substantially pricier compared to equivalent components in petrol engines. For instance, replacing a diesel particulate filter (DPF) can be an expensive endeavour, sometimes reaching up to $8000 for certain models.

5. Urban driving challenges:

Diesel cars equipped with diesel particulate filters (DPFs) face challenges in urban driving environments. Continuous short trips common in city driving can lead to DPF clogging, resulting in harmful emissions polluting the atmosphere. Moreover, the replacement cost of a DPF is notably high, potentially adding a significant financial burden to diesel car owners.

6. Potential repair costs:

Used diesel cars, if not properly serviced and maintained, may incur higher repair costs compared to their petrol counterparts. This aspect highlights the importance of diligent maintenance and service history documentation for diesel car owners.

7. Limited benefits in urban settings:

Diesel cars may not offer significant fuel savings for drivers who primarily navigate urban environments. In smaller-sized diesel cars, the fuel efficiency benefits may not be as pronounced, especially for those who predominantly drive in town.

8. Noise and refinement:

While modern diesel engines have made strides in refinement, some still emit noise reminiscent of trucks, which may not appeal to all drivers.

9. Accessibility concerns:

Some service stations still have diesel bowsers located away from the main court and without proper covering, which could inconvenience diesel car owners during inclement weather or late-night refuelling trips.

These points underscore the various considerations and challenges associated with owning a diesel car, requiring prospective buyers to weigh the pros and cons carefully before making a decision.

Conclusion

In conclusion, the choice between petrol and diesel cars presents a multifaceted decision, influenced by individual needs, budget considerations, and environmental awareness. When deliberating 'Should I buy a diesel car?' it's crucial to weigh the compelling benefits such as fuel efficiency and towing capabilities against the higher costs and maintenance challenges. As we traverse towards a greener future, exploring alternative options like hybrid or electric vehicles becomes essential. By considering the pros and cons outlined here, you can confidently navigate the diesel dilemma and make a choice that aligns with your values and driving requirements in today's ever-evolving automotive landscape

FAQs

  1. Are diesel cars more suitable for highway driving or city commuting?

Diesel cars tend to be more suitable for highway driving due to their fuel efficiency and long-distance capabilities.

2. Do diesel cars typically have more torque and better towing capabilities?

Yes, diesel cars typically have more torque, making them better for towing heavy loads.

3. Are diesel cars more environmentally friendly compared to gasoline cars?

Diesel cars emit less CO2 but produce higher NOx and particulate matter, impacting air quality and environmental considerations.

4. What are the potential maintenance and repair costs associated with diesel engines?

Potential maintenance and repair costs for diesel engines can be higher due to complex systems and specialised parts.

5. Are there any government incentives or tax benefits for owning a diesel car?

Government incentives and tax benefits may vary; some countries offer incentives for cleaner vehicles, including diesel cars meeting emission standards.

6. How do diesel cars perform in cold weather conditions?

Diesel cars may face challenges starting in cold weather due to higher compression; engine block heaters or additives can improve performance.

Rising petrol prices got you wanting to go back to diesel cars? If you’re deliberating between buying a petrol car or a diesel car, and wondering 'is it worth buying a diesel car in Australia?', the answer isn't that simple! The choice entirely depends upon your budget, your concerns and your personal preferences.

Are diesel cars still relevant in 2024? Well, yes. As per AADA’s report for 2023, 31.1% used cars sold in Australia were Diesel, while 65.0% were petrol. So, they haven’t become dinosaurs in this transitional word of hybrids and EVs, at least yet?

However, should you even invest in diesel cars? To help you through this diesel dilemma, we’ve curated a list of the pros and cons of buying a diesel car that should make this decision easy for you.

Is a diesel car right for me?

A debate as old as its engine, is owning a diesel car is the right choice for me, is a rather subjective question with a very nuanced answer. Car owners can benefit from owning a diesel car, provided you and your car have diesel needs! Certain car owners in Australia, especially those who travel long distances or have high annual mileage, can benefit greatly from choosing diesel cars. Here's why:

  • With Diesel engines, you get more bang for your buck. You can travel farther on each tank, meaning fewer stops and potentially lower fuel costs overall, especially on long hauls.
  • Diesel's muscle makes light work of hauling heavy loads. This is especially beneficial if you own a trailer or caravan, essentially any car you can use for towing.
  • Diesel's extended range is advantageous for those living far from fuel stations.
  • While diesel cars may have a higher upfront cost compared to petrol, the long-term savings from their efficiency and durability can be significant. Moreover, modern diesel engines are just as clean as their petrol counterparts, thanks to cleaner fuels and improved emission control technology.

But, as the world moves towards sustainability, Australia's going green, so consider the environment too. If that is a matter of concern for you, you should explore hybrid or electric options for an even more environment-friendly ride.

Diesel's a great choice for high-mileage Aussies, but for the planet's sake, keep future options in mind!

Advancements in diesel technology

Diesel is globally renowned as the top-performing internal combustion engine, surpassing its counterparts such as gasoline, compressed natural gas, and liquefied natural gas in energy density, power, and fuel efficiency.

The fuel efficiency of advanced diesel is unparalleled, thanks to the energy-rich properties of diesel fuel and the completeness of combustion, which generates more useful mechanical energy compared to other fuels. Ultra-low sulfur diesel fuel (ULSD) is at the forefront, offering the highest energy density among transportation fuels and surpassing even gasoline in energy content. Additionally, advanced renewable low-carbon biodiesel fuels further enhance the environmental benefits of diesel technology, reducing greenhouse gas and other emissions by up to 80% compared to conventional petroleum diesel.

With ULSD becoming the standard diesel fuel worldwide and the integration of advanced biodiesel fuels, diesel technology continues to pave the way towards a cleaner, more sustainable future for transportation.

Pros of owning a diesel car

Listed below are some of the pros of owning a diesel car:

1.Fuel efficient:

Diesel leads the charge in efficiency, surpassing petrol engines with their reduced fuel consumption and lower CO2 emissions, making them the environmentally conscious choice. Petrol-powered engines typically operate at an efficiency of around 20%, meaning only 20% of the fuel consumed is utilised to move the vehicle. The remaining 80% is lost to friction, noise, engine functions, and exhaust.

In contrast, diesel-powered engines are significantly more efficient, achieving efficiencies of 40% or higher. This means they can extract more energy from the fuel compared to gasoline engines, resulting in better fuel economy and reduced fuel consumption.

2. Produces more torque:

Diesel engines are kings in pulling power,  enjoying higher torque compared to their petrol counterparts. This formidable strength makes them the ideal choice for towing heavy loads or comfortably accommodating a full complement of seven passengers.

Diesel cars have higher torque compared to petrol cars. This is because diesel engines are designed to prioritise torque over horsepower, making them well-suited for tasks requiring heavy loads to be moved efficiently. In contrast, petrol engines tend to prioritise horsepower, which results in a fast-revving characteristic favoured by enthusiasts.

3.  Excellent mileage:

With their unparalleled fuel economy, diesel engines redefine the concept of long-distance travel. One tank of diesel can propel you double the distance of a petrol tank, providing unparalleled efficiency and reducing the frequency of trips to refuel.

Diesel cars often reach 200,000 miles before needing major repairs, twice the mileage of gas engines, before they potentially start requiring frequent maintenance.

4. Subject to lesser price fluctuations:

Diesel fuel tends to remain stable amidst the turbulence of fluctuating fuel prices. Unlike petrol, diesel prices remain relatively steady, providing consumers with assurance and financial predictability.

Diesel prices in Australia's major cities, including Sydney, Melbourne, Brisbane, Adelaide, and Perth, continued to drop throughout the June quarter of 2023. These stable and decreasing diesel prices indicate that diesel cars are a sound investment, as they are less prone to fluctuations and offer cost-effective fuel options.

5. Surprisingly economical:

Surprisingly, certain diesel engines outshine even hybrid alternatives in terms of both fuel efficiency and upfront cost. This economic advantage positions diesel-powered vehicles as an attractive and accessible option for budget-conscious consumers.

6. Durable:

Engineered to endure the rigours of high compression ratios, diesel engines boast exceptional longevity. Setting records in endurance, vehicles such as those from Mercedes-Benz have clocked over 900,000 miles on their original engines, solidifying diesel's reputation as the epitome of endurance and resilience.

7. Simple:

Diesel engines embrace a philosophy of simplicity, boasting fewer components and eliminating the need for frequent tuning or spark plug replacements. This streamlined design ensures reliability and ease of maintenance, further enhancing the appeal of diesel-powered vehicles.

8. Great on highways:

Diesel engines excel on the open road, effortlessly overtaking other vehicles and cruising smoothly. They require fewer gear changes, making highway driving as easy as it gets, and ensuring a comfortable journey.

Cons of owning a diesel car

Listed below are some of the cons of owning a diesel car:

1.Higher fuel costs:

Despite diesel engines' efficiency, regular unleaded fuel is generally cheaper at the pump compared to diesel. In comparison to petrol, diesel prices often come with a premium, which can dent the wallet of diesel car owners. Prices can vary in accordance with the city, so you may want to refer to that as well.

2. Initial cost:

Diesel models tend to command a higher price tag, typically ranging from 10-15% more expensive than their petrol counterparts. For example, a popular diesel car might have a higher starting price compared to its petrol version. For instance, MAZDA CX-8 Touring, which is a petrol variant costs about $54,602, but its diesel counterpart MAZDA CX-8 Touring- Active costs about $61,581.

3. Long-term cost considerations:

While diesel cars may promise fuel efficiency, potential buyers should carefully calculate the duration it takes to recoup the initial investment, factoring in diesel prices and anticipated mileage. This consideration is crucial for determining the economic viability of owning a diesel car over time.

4. Maintenance expenses:

Diesel engines often come with higher service costs, particularly regarding fuel system components. These parts can be substantially pricier compared to equivalent components in petrol engines. For instance, replacing a diesel particulate filter (DPF) can be an expensive endeavour, sometimes reaching up to $8000 for certain models.

5. Urban driving challenges:

Diesel cars equipped with diesel particulate filters (DPFs) face challenges in urban driving environments. Continuous short trips common in city driving can lead to DPF clogging, resulting in harmful emissions polluting the atmosphere. Moreover, the replacement cost of a DPF is notably high, potentially adding a significant financial burden to diesel car owners.

6. Potential repair costs:

Used diesel cars, if not properly serviced and maintained, may incur higher repair costs compared to their petrol counterparts. This aspect highlights the importance of diligent maintenance and service history documentation for diesel car owners.

7. Limited benefits in urban settings:

Diesel cars may not offer significant fuel savings for drivers who primarily navigate urban environments. In smaller-sized diesel cars, the fuel efficiency benefits may not be as pronounced, especially for those who predominantly drive in town.

8. Noise and refinement:

While modern diesel engines have made strides in refinement, some still emit noise reminiscent of trucks, which may not appeal to all drivers.

9. Accessibility concerns:

Some service stations still have diesel bowsers located away from the main court and without proper covering, which could inconvenience diesel car owners during inclement weather or late-night refuelling trips.

These points underscore the various considerations and challenges associated with owning a diesel car, requiring prospective buyers to weigh the pros and cons carefully before making a decision.

Conclusion

In conclusion, the choice between petrol and diesel cars presents a multifaceted decision, influenced by individual needs, budget considerations, and environmental awareness. When deliberating 'Should I buy a diesel car?' it's crucial to weigh the compelling benefits such as fuel efficiency and towing capabilities against the higher costs and maintenance challenges. As we traverse towards a greener future, exploring alternative options like hybrid or electric vehicles becomes essential. By considering the pros and cons outlined here, you can confidently navigate the diesel dilemma and make a choice that aligns with your values and driving requirements in today's ever-evolving automotive landscape

FAQs

  1. Are diesel cars more suitable for highway driving or city commuting?

Diesel cars tend to be more suitable for highway driving due to their fuel efficiency and long-distance capabilities.

2. Do diesel cars typically have more torque and better towing capabilities?

Yes, diesel cars typically have more torque, making them better for towing heavy loads.

3. Are diesel cars more environmentally friendly compared to gasoline cars?

Diesel cars emit less CO2 but produce higher NOx and particulate matter, impacting air quality and environmental considerations.

4. What are the potential maintenance and repair costs associated with diesel engines?

Potential maintenance and repair costs for diesel engines can be higher due to complex systems and specialised parts.

5. Are there any government incentives or tax benefits for owning a diesel car?

Government incentives and tax benefits may vary; some countries offer incentives for cleaner vehicles, including diesel cars meeting emission standards.

6. How do diesel cars perform in cold weather conditions?

Diesel cars may face challenges starting in cold weather due to higher compression; engine block heaters or additives can improve performance.

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