Like gasoline engines, diesel exhaust must be smokeless. In addition, no smoke should come out of the open neck of the oil filler pipe when the engine is warm. Since a diesel engine is noisier than a gasoline engine, you must distinguish between running noise and the sound of worn pistons, connecting rods, camshafts, etc. If you have any doubts about the condition of the engine, seek professional help.
Turbodiesels are very popular because turbocharging fits well with diesel performance. Turbochargers operate at low boost pressure and at low engine speeds, giving them a longer service life than gasoline engines. Turbodiesels are excellent for tractors and multi-ton trucks.
However, it is difficult for diesel automatics to meet the demands of an automatic transmission due to the flat torque curve. Only a few manufacturers are concerned about this problem. Among them are Citroen, Mercedes, Peugeot and the recently joined Opel, but even then they use automatic transmissions only on middle-class cars.
Thanks to their growing popularity, diesels are no longer looked upon as poor relatives, and in terms of their level of finish they are fully consistent with their gasoline counterparts.
When buying, pay attention to the residual value of the diesel. At one time, diesel cars gave a boost to car sales in Germany, but sales peaked four years ago and are still on a gradual decline, so make sure you don't overpay for the honor of owning a diesel car.
Check mileage. Diesel cars are snapping up for their potentially high reliability and potentially high mileage. Especially when they are bought new. But this does not mean at all that you should not pay attention to the odometer. Indeed, many dealers do not like to deal with cars whose mileage has exceeded 80 thousand km and, accordingly, adjust the price for them. Or, without further ado, they simply reset the mileage on the counter. A mileage of 160,000 is quite natural for a well-maintained diesel, but think twice if the meter shows 320,000 km or, especially, if it is a used taxi with such mileage.
With the exception of the engine, most diesel cars are identical in design to their gasoline counterparts, the same applies to suspensions, brakes, but consider the prices of spare parts. For example, exhaust systems last a long time, but differ from similar gasoline engines. And if you are used to buying parts from salvage car dealers, then keep in mind that parts of gasoline engines may be similar in appearance and fit in size, however, the diesel cylinder block is different from a similar gasoline engine block and in most cases cannot be selected as a replacement. Gear ratios of gearboxes and clutches also differ.
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