When should a diesel engine be replaced with a new one?
The usual course of action is to replace it when major repairs are needed, for example if the engine has suffered irreparable damage or it is difficult to find other parts.
Are you a car enthusiast looking to improve its performance? You can buy a second-hand diesel engine to increase the power or modify the driving characteristics of your vehicle.
It is also possible to adapt engines from other cars for yours, but it is a process that requires a great deal of work and modifications. Consider whether it is worth going through the whole process or looking for an alternative with a compatible engine.
The most reliable second-hand diesel engines
Of the vehicles that have come to market in the last 20 years, these are the ones that, according to experts, are the most reliable on the market:
Mercedes-Benz 2.1 CDI BlueTec
This engine was manufactured from 2011 to 2018, with a design focused on minimising nitrogen oxide (NOx) emissions, although this had no effect on the engine's power, and it is considered one of the best diesel engines.
They can still be found on the market, offering power outputs from 136 to 204 hp. However, it should be noted that everything depends on the engine model. For example, in Vito vans the power was reduced to maximise reliability.
It is an ideal option for those looking for a long-lasting diesel engine for their Mercedes.
Volkswagen / Audi 2.0 TDI CR
The VAG Group managed to make its 1.9 TDI one of the best diesel engines ever made, but from 2015 onwards they made the leap to the next generation, the 2.0 TDI CR.
It corrects the minor reliability issues of previous generations, while also increasing engine power, with very acceptable fuel consumption, making it perfect for those who spend many hours on the road.
On top of that, it is present in many of the best vehicles of recent years, such as the Audi A5, the Volkswagen Golf, the Skoda Karoq, and the Seat León.
Audi 3.0 TDI V6
Although a more current version of this engine began to be sold from 2015 onwards, it is possible to find this model on the second-hand market at a very attractive price, standing out for having a short incident history.
It debuted as an exclusive engine for Audi vehicles, but later began to be used in other Volkswagen models, clearly demonstrating its efficiency. Its only downside is that its maintenance is expensive, but it is worth it for its great performance and low fuel consumption.
Toyota 1.4 D4D
Although it can be difficult to buy this used diesel engine, if you get the chance to get your hands on one, don't think twice!
With proper maintenance and safe driving without pushing it too hard, you'll have an engine for many years, standing out for its strong performance and being one of the lowest diesel consumers.
PSA 2.0 HDI
The PSA Group has launched multiple engines for Peugeot and Citroën vehicles over the years, with notable examples such as the DW10 engine, which is ideal for those who need to cover many kilometres on the road.
One of the most interesting versions, if you get the chance to get your hands on one, is the 136 hp version, which is compatible with cars such as the Peugeot 407 or the first 308.
Renault 1.5 dCi
The engine that the brand began to include in its vehicles at the beginning of the 2000s, and we can say that the years have treated it very well.
With each new vehicle model they have modernised all its features, achieving the perfect balance between performance, price, and reliability. If you're looking for a second-hand diesel engine to cover plenty of kilometres, you shouldn't think twice.
What should you bear in mind when buying a second-hand diesel engine?
The engines we have mentioned above are, from our point of view, the best alternatives for those looking for a vehicle with a diesel engine or wanting to replace the old one with a new one.
Bear in mind, however, that not all engines are compatible with all cars, as they vary according to size, shape… and, of course, if you don't know much about engines or cars, it would be best to have the replacement done at a workshop.
What should you look out for when buying one? First and foremost, that it is compatible with your vehicle and, above all, that it suits your specific needs. If you only use the car at weekends or very occasionally, you can look for a more affordable alternative.
On the other hand, if your work requires you to cover many kilometres, look for an engine with good power, low fuel consumption, and long durability. It wouldn't make sense to invest in a new one only to have to replace it in a few months, would it?