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Technique: from improved service life to fuel economy, the motor oil challenge

In the last 20 years; well beyond the progress of the engine; the performance of the oil has improved. The service life of the latter has been considerably extended and performance in terms of fuel consumption; two opposing properties which are therefore a matter ofjournaltimepromise; has been balanced well. In fact; due to the demand for greater energy efficiency around the world; oil must also undergo an evolution in its performance.

Lubrication is essential when metalsjournaltimee into contact with each other; as is the case in the operation of an engine. By forming an ultra-thin film of oil on the metal surface; it prevents metals fromjournaltimeing into direct contact with each other. Lubrication is very important; especially in machines exposed to high temperatures; such as engines; because when the oil film breaks; seizure occurs. The lubrication capacity is highly dependent on the capacity of the pump that delivers the lubricating oil; as well as the performance of the lubricating oil itself; so the performance of the lubricating oil is very important.

Engine oil life differs depending on the type of engine it is used for; but looking back over the past 20 years; there has been a gap between oil changes. In the past; changing the oil every 5000 km was the norm; but in recent years an engine can safely reach 30;000 km without problems. This is the effect of enhancing the antioxidant performance of the oil. Obviously; for a trail bike; don’t wait 30;000 km before changing the oil!

Technique: from improved service life to fuel economy, the motor oil challenge

In addition; a dispersant and cleaning additive is also essential as long-distance oil deposits will affect the fuel if they accumulate inside the engine. However; the dispersant works against the lubricating properties of the oil: it is a factor that deteriorates energy efficiency. However; in recent years the demand to improve fuel efficiency has grown; and the reason is simple: when itjournaltimees to reducing friction losses; gears and bearings require surface treatment or even a material change; and the pieces get more expensive. It is often said that if the reduction in friction losses in mechanical parts is of the order of € 100; in the case of oil it is of the order of € 1. The choice is made quickly.

In the American Society of Automotive Engineers (SAE) standard; which is used to classify the viscosity of oils; the number before W is the low temperature viscosity (W stands for Winter) and the number after is the viscosity at low temperature. temperature. Thus; we have a multigrade oil; and the greater the difference between the two numbers; the greater the operating range of this oil. Thus; for example; a 0W20 oil guarantees the ability to start cold at a temperature of -40 ° C while maintaining its lubricating properties. However; it cannot be used in a circuit; because its hot lubrication powers are more limited.

It is difficult to achieve both antioxidant performance and interesting energy efficiency. If the emphasis is on the antioxidant; it is put on a longer service life; the amount of additives will be high; therefore; the viscous resistance will increase; and the energy efficiency will deteriorate. When designing the oil; it is important to balance these conflicting elements to improve overall performance. In recent years; the accuracy of simulations has improved and the effects of the additivejournaltimebination can be largely predicted; but even so; they are often not 100% known until the first real tests.

In the past; molybdenum additive was used to improve the fuel efficiency of motor oil; but if it is used at 500 ppm or more; the deposits of molybdenum derivatives will be significant. The standards of oils have evolved; their design also with an amount of additive that does not produce deposit; and this reduces the viscosity. Lowering the viscosity of the oil is effective for energy efficiency at low temperatures; but it bjournaltimees difficult to maintain the oil film at high temperatures.

Currently; the energy efficiency of fuel stands out. Of course; oil is also needed to improve engine performance. In the past; longevity was the most important requirement; but in recent years energy efficiency has bjournaltimee a top priority. However; used oil is a waste that must also be minimized. Petroleum engineers now need to strike a new balance between longer life and lower fuel consumption.

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