Diesel engines typically last longer than petrol engines. While the two types of engines have similarities, the way they use fuel means they’re suited to very different purposes.
Diesels use heavy-duty internal components that operate at relatively low Revolutions Per Minute (RPM), and while they have a high cylinder compression ratio, they’re built tough to withstand the additional pressure. Diesel engines are often found in heavy-duty commercial equipment where they’re expected to run continuously. To ensure they stand up to those harsh conditions, diesel engines are built tough, and that means their lifespan is hard to beat.
Do Diesel Engines Last Longer Than Petrol Engines?
Here’s how diesel engines and petrol engines compare:
Diesel Engines | Petrol Engines | |
|---|---|---|
Typical Compression Ratio | 20:1 | 12:1 |
Maximum RPM | 3000 - 5000 RPM | 6000 - 8000 RPM |
Typical Lifespan | 500,000 - 1,000,000 km | 200,000 - 300,000 km |
Extend the life of your diesel
If it’s time for a diesel repair service or any other maintenance, get in touch with Kel Stanton’s Mobile Diesel Service!
We’re a team of mobile diesel mechanics based in Caboolture. We service all types of diesel vehicles, including trucks, buses, 4WDs, mining equipment, earthmoving equipment and more.
Contact us today to make a booking!
How Much Longer Do Diesel Engines Last?
It’s common for diesel engines to last longer than petrol engines, with some models living for 1,000,000 kilometres or more. By contrast, the petrol engines found in passenger cars typically only last for 200,000 kilometres.
Why Do Diesel Engines Last Longer?
Diesel engines last longer because they use a slightly different combustion cycle to petrol engines.
In diesel engines, the pistons are only used to compress air. Compression causes the air to heat up. Once it’s at maximum pressure, atomised diesel fuel is injected into the cylinder and immediately ignites. This drives the piston downwards and generates rotational power.
Compare this to petrol engines, where the pistons are used to compress a mixture of petrol and air. This limits the maximum amount of compression that can be achieved before the petrol autoignites. It’s important to avoid autoignition within an engine, because it reduces the output and fuel efficiency.
Diesel engines contain toughened components that can withstand the amount of power generated under the high-compression environment. This causes them to last significantly longer than petrol engines.
Factors Affecting the Lifespan of Diesel Engines
There are several factors that extend the average lifespan of a diesel engine:
How Australian Conditions Affect Diesel Engines
Australian driving conditions, like high temperatures and dusty outback environments, have a significant impact on the performance and lifespan of diesel engines.
In regional and remote areas, corrugated roads and heavy towing put additional strain on engine mounts, suspensions and turbochargers. Coastal regions can introduce salt and humidity, increasing the risk of corrosion. Even city driving affects diesel engines, with frequent short trips preventing the engine from reaching optimal operating temperature, which can lead to soot buildup and reduced efficiency.
Because of these varied conditions, diesel engines in Australia require consistent servicing, high-quality fuel, and timely replacement of filters and lubricants. When properly maintained, diesel engines are well suited to Australia’s rugged landscapes.
Is It Worth Buying a Diesel 4X4?
If you’re frequently hitting the road for long-distance driving or towing heavy loads like boats and caravans, you should consider a diesel 4X4. A diesel engine excels in these areas, giving you greater fuel economy and durability.
If you mostly do city driving or short trips, petrol or hybrid might be a better alternative.
Tips to Prolong the Life of Your Diesel Engine
Like any other engine, diesels need maintenance, and normal use can wear down critical components. If you want to prolong the life of your diesel engine, we have a few simple tips:
The best way to extend the life of a diesel engine is to regularly change the oil and check the fuel. Degrading engine oil and contaminated fuel are two of the biggest killers of diesel engines, so staying on top of those issues can help you avoid the worst!
Keep Your Engine Turning With Kel Stanton’s Mobile Diesel Service!
Diesel engines are built tough. If you want to keep your equipment running smoothly, it needs regular maintenance and servicing.
Kel Stanton’s Mobile Diesel Service is a mobile diesel mechanic that works across the Brisbane region. We come to you and provide regular maintenance, servicing and repairs for all types of diesel vehicles and equipment.
We’re experienced in servicing trucks, buses, trailers, commercial vehicles, farm equipment, mine equipment and more! Talk to us about our fleet servicing options, or give us a call to book your diesel maintenance appointment.
Frequently Asked Questions
Yes. Because diesel engines are built with heavier-duty components, run at lower RPMs and handle higher compression ratios, they tend to be more durable and can last many hundreds of thousands of kilometres with proper maintenance.
With regular maintenance, many diesel engines can run between 500,000 km and 1,000,000 km before needing major overhaul or replacement.
Not necessarily more frequently, but they do have specific maintenance needs. Keeping up with regular fuel-system checks, oil changes suited for diesel, and servicing components unique to diesel engines helps maintain their long lifespan. That’s why it pays to let a diesel expert like us take care of your engine.
Yes. Diesel engines are especially well-suited for heavy usage, long-distance driving or towing because of their durability, high torque output and longevity.