According to Bell Performance and Road and Track, customers who drive many highway miles often prefer diesel engines, since they are more efficient on these roads than gas engines. Diesel fuel simply packs more energy in every gallon than gas fuel, which makes it more economical overall.
Why do some engines need diesel?
PRO: Diesel engines are built more ruggedly to withstand the rigors of higher compression. Consequently, they usually go much longer than gas-powered vehicles before they require major repairs. … PRO: Because of the way it burns fuel, a diesel engine provides far more torque to the driveshaft than does a gasoline engine.
Why are all engines not diesel?
Because diesel is a complex, high-energy fuel made of long hydrocarbon chains, it has more potential than diesel with regard to fuel efficiency and emissions reduction. It is much easier for car manufacturers to produce complete combustion — or nearly complete — in a gasoline engine than a diesel engine.
What are the disadvantages of diesel engines?
Cons of diesel cars
- Diesel cars tend to be more expensive to buy than similar petrol models.
- Diesel fuel usually costs more.
- Servicing can be more expensive, although you don’t need to do it as often.
- Insurance can be 10-15% higher. [ …
- Diesel cars produce a lot more NO2.
Why do diesels last longer?
Diesel engines do last longer than petrol ones. Diesel is a light oil and when burned and used as fuel by the vehicle it lubricates the parts of the engine. This prolongs the life of the engine. … This is partly because of the intricate fuel pump which is expensive to repair or replace.
Why don’t we use diesel in the US?
Relative to a gasoline-burning engine, it is more difficult to control NOx in a diesel, which is why, to meet those comparatively stricter emissions limits, diesels in the US are required to use expensive, onboard after-treatment systems, which decrease the amount of particulate matter that leaves the tailpipe.
Will a little gas hurt a diesel engine?
Let’s say you accidentally drop a small amount of gasoline into your diesel fuel. … This means the diesel fuel will prematurely ignite in the diesel engine, which can lead to engine damage. Gasoline contamination can also damage the fuel pump and mess up diesel injectors. This happens because of a drop in lubrication.
What is high mileage for a diesel engine?
Diesel Rule 1: NEVER buy high mileage
To be clear – avoid diesel cars with over 100,000 miles on the clock. Just avoid them.
Is it worth buying a diesel?
Despite the negative headlines, the impressive fuel economy of diesel cars means they still make more sense than petrol and hybrid models if you do a high annual mileage or cover a lot of miles on the motorway. … Just bear in mind that, if your driving is mainly town-based, diesels really are best avoided.