Engine oil consumption rates
The problem of motor oil consumption worries many motorists. As you know, oil consumption is one of the important indicators of the overall condition of the engine. You can hear from some car owners, that the engine does not take oil, that is, the level remains the same or remains within acceptable limits from replacement to replacement.
Others note the increased or high consumption of oil in the engine, which makes it necessary to add lubricant. Let's note at once, the engine manufacturers themselves specify the norms of oil consumption in the engine. This means, that the power unit can consume oil within certain limits, that the power unit can consume oil within certain limits.
that the power unit can consume oil within certain limits. that the power unit can consume oil within certain limits, that the power unit can consume oil within certain limits. P.
In this article we will consider, that the power unit can consume oil within certain limits, that the power unit can consume oil within certain limits.
that the power unit can consume oil within certain limits
so, let's start with that, that all engines use engine oil to a greater or lesser extent. This is taking into account the design features of the internal combustion engine, namely, due to the urgent need to lubricate the components and parts of the CHP. In other words, the main losses of lubricant occur as a result, that you need to apply oil to the cylinder walls.
This area in the engine is a heat-loaded area. For this reason, there is a partial evaporation and combustion of oil. Also, some of the oil is not removed from the cylinder walls by piston rings, as a result, the remaining lubricant burns together with the fuel in the combustion chamber.
Usually, in modern engines, the declared oil consumption is, in the middle, from 0.1 to 0.3% of total fuel consumption, which was spent to overcome any stretch of road. It turns out, if the car has passed 100 km, and the cost is 10 liters of fuel, then consumption will also be the norm, in the middle, 20 grams of butter.
It turns out, oil consumption can be considered acceptable, if it does not exceed the mark close 3 liters. on 10 thousand. kilometers traveled. It is also important to understand, that the flow rate will strongly depend on the type of engine, its forcing, etc.. d.
Example, for many gasoline atmospheric internal combustion engines the norm is about 0.1 %. On gasoline turbocharged engines, the consumption rate is significantly higher. As for the diesel engine, the declared consumption of oil on norm will be more than any petrol analogue and makes, in the middle, from 0.8 to 3 %. Specified 3 % spend forced turbodiesels with two turbines, etc.. P.
Rotary motors can also be mentioned separately, which have a special tendency to the consumption of lubricating fluid. Such units (taking into account their fully operational condition) spend about 1-1.2 liters of oil on 1000 km. mileage. For reference, in the manuals for the various engines indicated, that the rate of consumption of oil for burning is 1 liters per 3 thousand. mileage, that is close 3 liters per 10 thousand. km.
At the same time, manufacturers also note, that the cost directly depends on the technical condition of the internal combustion engine, and from the peculiarities of the operation of a particular vehicle (load on the unit, speed, etc.. d.)
What determines the consumption of oil in the engine and how to reduce it
As mentioned above, oil is consumed in any engine, since the oil film on the parts for protection against dry friction burns in the chamber together with the fuel charge. If we add to this the natural wear of the internal combustion engine during operation, then the oil consumption further increases.
However, it becomes quite obvious, what 3 liters of oil on 10 thousand. km. for a small car with an in-line atmosphere can be considered a big expense, however, for a powerful unit with a large working volume, this is a perfectly acceptable figure. Practice shows, that even if the engine started "eating" oil above normal, it is economically more profitable to simply add oil, than to overhaul the motor at once only because of the increased expense.
The point is, that at many service stations masters prefer not to diagnose the separate reason of the raised expense of oil, and immediately offer the owner to make overhaul. It is important to consider, that such expensive repairs are not always necessary.
- First of all, oil consumption may be increased due to that, that the oil is leaking from the engine. In this case it is enough to replace linings and epiploons. Usually, it is necessary to pay attention to a lining of a valve cover, gasket of the cylinder head, front and rear crankshaft seal, camshaft oil seals, valve seals, etc.. d.
In various situations, the oil may leak on the outer surface (leak out), as well as penetrate other systems. Example, if oil leaks between the gearbox and the engine, the crankshaft seal is to blame, and a puddle may form under the machine.
If the cylinder head gasket is problematic, there may be no stains on the outside, the engine will be dry. The oil will get into the coolant, The coolant is cloudy, the oil in the engine will also start to foam, an emulsion will appear under the oil filler cap and on the dipstick.
- If oil is actively consumed in the engine on a waste, bluish oily smoke will come out of the exhaust pipe. In this case, especially compared to the current, to establish the reason without disassembly of the engine is much more difficult.
However, even in this situation, you can try to fight with the child, before agreeing to repairs. First of all, oil consumption depends on the engine operation mode. In other words, driving at high speeds leads to higher temperatures and loads, the oil is diluted, worse removed by rings from the walls of the cylinders, smoke, etc.. d.
- It is also important to understand, that the lubricant may not be suitable for the engine according to certain parameters. This means, what you need to know, what oil to choose for the engine and what features should be considered.
If the engine is worn, then in parallel it is necessary to take into account the peculiarities of the selection of oil for engines with high mileage. In a nutshell, the low viscosity material forms a thin film, which the oil rings cannot remove from the walls. If thick grease, then the film is very thick, the rings cannot remove such a layer in full.
Given the above, it becomes clear, that you need to use the most suitable oil as per the tolerances, and the high-temperature viscosity index. Example, from the list of recommended oils in the manual you need to choose a product with a higher viscosity compared to, which is flooded at the moment.
You can also switch from synthetics to semi-synthetics, which also in some cases reduces oil consumption. The main thing, that such semi-synthetics were allowed for use in a particular internal combustion engine and meet the recommendations of the engine manufacturer.
- Oil removable caps (valve seals, oil-reflecting caps) is also an element, problems with which increase the oil appetite of the unit.
At the same time on many internal combustion engines replacement of caps can be performed without removing the cylinder head, the cost of spare parts is quite insignificant. Lubricant consumption after replacement is significantly reduced in some cases.
The main reason for failure of valve seals is their drying and curing, since the elements are made of rubber. Gaskets can also be affected by oil that is not suitable for the engine, aggressively affects the rubber.
We also recommend reading the article about it, existing additives in the engine to reduce oil consumption and reduce smoke. In this article you will learn about the types and features of such additives in motor oil.
- Wear of piston rings is often similar in symptoms to their occurrence. If in the first case the rings need to be changed, that is, disassembly and repair of the internal combustion engine is required, then in the second you can decok the piston rings.
If simple, accumulation of soot and coke does not allow the ring to move in the groove, that is, the rings lay. Decreased mobility means, that the ring does not perform its function, the oil is poorly removed from the walls and smokes in the combustion chamber.
To solve the problem there are washings, which are poured into the lubrication system. You can also use washing oils. The radical way is as follows, when a special composition for decoking piston rings is poured into the candle wells.
Each of the solutions has its advantages, and cons, however, for a worn-out engine, in many cases it is possible to reduce oil consumption and extend engine life before overhaul..
- Increasing the pressure in the crankcase also causes the consumption of lubricant. In simple words, the high pressure of the crankcase gases causes the oil to end up there, where it should not be.
As a result, the oil enters the cylinders through the intake, then burns in the engine along with the fuel. In such a situation, you need to diagnose and clean the crankcase ventilation system.
- Problems with the turbocharger also lead to this, leaking oil in the supercharger area, the oil also penetrates the cylinders through the inlet, etc.. d.
To solve the diagnosis and repair of the turbine. As a last resort, you can replace the turbocharger, this will also reduce the consumption of lubricant.
As a result
Given the above, we can conclude, that the main reason for overhauling the engine is the presence of significant defects and damage, as well as heavy wear of parts and production on the walls of the cylinders (zadiraki, geometry change, etc.).
We also recommend reading the article about it, how to choose engine oil with high mileage. In this article you will learn about the features of the selection of lubricants for a worn-out power unit.
In this case, remove the "zhor" oil only by decoking, replacement of rings, oil caps or switching to a more viscous oil will no longer work. Engines with such damage usually have low compression, it is bad to start on cold, and hot, significantly lose power.
Extraneous knocks and noises may be present during operation of the unit. Usually, after disassembly and defect the block needs to be borne / gilzovat, perform crankshaft grinding, etc.. d. In other words, necessary overhaul.
If the engine is worn out, but works fine, while oil consumption is above normal, then you should not expect an immediate increase in oil consumption. Lubricant will be consumed more and more, but this problem will progress slowly.
It turns out, topped up several liters of oil for each 10 thousand. km. will allow to operate such motor more than tens of thousands of kilometers without overhaul (unless other breakdowns occur). In this case, the cost of oil is more profitable to top up, than to repair the motor.
Additionally use more viscous oil, replacement of valve seals and cleaning of the crankcase ventilation system will help reduce the overall consumption of lubricants and the cost of maintenance and service of the engine.
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