Automotive engine oil use Several Mistakes

Engine parts surface movement generated intense friction. The role of engine oil between moving parts to form a good film, the contact surfaces are separated to dry instead of wet rubbing friction, performance parts becomes solid friction to fluid friction. According to statistics, the vehicle due to poor lubrication caused by the failure of 41% of the total fault. Therefore, to give full play to the role of lubricating oil, to ensure reliable engine lubrication, reduce wear and reduce the failure to extend the life of the vehicle, the engine oil must be selected from, attach importance to use. However, some drivers and Vehicle Administration personnel, there are some misconceptions often used in lubricating oil, resulting in unnecessary losses. In the engine oil used in common errors are the following:

1, the bigger the better oil viscosity

There are many drivers are considered: the bigger the better lubricating viscosity lubricating oil grades (centistokes number kinematic viscosity at 100 ℃), the higher the better. In fact, this understanding is one-sided. The greater the viscosity, the film surface of each friction between moving parts thicker. Oil film thickness, although beneficial to prevent wear of the friction surface, but also large frictional resistance along with increased power loss. Foreign data show that lowering oil viscosity 1 cSt, fuel savings of approximately 1.5%. In addition, experiments have proved that when the viscosity of lubricating oil exceeds requirements, but also to increase engine wear, engine wear because about 2/3 of the amount produced in the early start. Using the viscosity of the oil, starting at a low temperature, because after a period of downtime, the friction surface oil has been lost, and viscosity, flow is slow and can not be added to the friction surface lubricant film formation, and therefore cause mechanical comparing a long time in dry friction and semi friction state, modifications parts causing increased engine wear. The original of a unit Ministry of Oil on three Jiefang Automotive, with the 6th and the 10th gasoline engine oil carried out under the same conditions as comparative experiments, the results show a 6 gasoline engine oil saving fuel by 7.9%, while the engine wear is reduced l / 3. Therefore, the viscosity of engine oil is not the bigger the better, but rather in ensuring the lubrication conditions, try to use a small viscosity oil. The low viscosity of the lubricant is one of the measures of the current fuel economy.

2, add oil as possible

The main role is to lubricate machinery lubricants to reduce friction, reduce wear, will accelerate the deterioration of lubricating oil is insufficient, even due to lack of oil caused by adhesion and abnormal wear parts. Too much oil, but is not desirable for two reasons: First, too much oil will be coming into the chamber from the gap between the cylinder and piston produce coke; the second is to increase the crankshaft connecting rod agitation resistance, so that the fuel consumption increases. Experiments showed that when the amount of fuel more than the standard 1%, fuel consumption will increase by 1.2%. Therefore, refueling must follow "small, spare" principle, so that the oil remains in the plane between 2 / 4-4 / 4.

3, lubricating oil mix different grades of matter

Some units of the management or the driver from a cost point of view, when seasonal maintenance, reluctant to replace the remainder of the engine oil, and add new oil to continue to use after a certain number, sometimes simply two different grades of lubricating oil mix. This approach seems like there is no problem temporarily, but in the longer term, but to accelerate the mechanical wear and tear, aging deterioration, costs actually increased. Different grades of oil (or hydraulic oil) can not be mixed. For example: gasoline engine oil and diesel oil can not be mixed, conventional oils can not be mixed with pressurized oil, single and multi-viscosity gear oil viscosity can not be mixed and so on. because:

(1) car manufacturers in the design, according to the structural characteristics of the car, the ambient temperature, conditions of use specified lubricant grades should be used, oil change, the number of other uses.

(2) different grades of oil, its physical and chemical properties are different, their chemical composition, viscosity, acid number and variety of additives (anti-wear agents, preservatives, antioxidants, anti-rust agents) and other major components and indicators directly affect the mechanical operation. If mixed use, its performance will change, mechanical operating temperature increased, a large amount of bubbles, and even deterioration. Make the car precision parts, running parts, seals working conditions change, reduce performance, accelerate engine wear, aging deterioration of seals, the seal is not good, causing lubricant leakage.

4, when the lubricating oil runs out when to replace

Some drivers do not think that as long as the finished lubricants do not replace, if less quantity, and casually to add some new oil can. H-beam Connecting Rods This approach is unscientific, because the lubricating oil quality is the key factor affecting the reliability and service life of the engine, the engine oil is the timely replacement guarantee reliable lubrication. Lubricating oil during use, due to contamination, oxidation and other reasons, the quality will gradually decline, while there will be some consumption, so reducing the number of, and constantly add new oil to the lubrication system, you can only make up for deficiencies in quantity, but not fully compensate the loss of lubricating properties. With time, the performance of the lubricant will become worse and worse, and even a serious impact to the engine, such as a sharp increase in the inner engine deposits, dynamic performance, the early parts of wear and tear, eventually leading to functional failures produce. To ensure long-term normal engine operation, reduce wear and must be replaced as required lubricants.