Common problems and solutions of lubrication oil:
● Do not mix different brands of quality lubricants
What car engine oil, in the technical specifications are clear requirements, should be required to use. However, in practice, it may run into the situation can not buy the right oil, in this case, the choice of viscosity level equal or close to, higher levels of quality lubricants, such as the SF-class level instead of SE, CD-level replacement Class CC, this generation of low to high, which can be temporary, or long term, long-term replacement should be extended drain intervals, to avoid waste. High-grade gasoline is one of important properties of lubricating oil to control the low-temperature sludge formation; and high-grade diesel oil is one of the important properties to have good oxidation resistance, to meet the gasoline engine, diesel engine operating conditions in different requirements.Therefore, in principle, should replace each other.

Lubricants contain additives, different brands of lubricant additives are not necessarily the same plus some additive mix antagonize the effect will reduce the performance. So try different brands of oil do not mix, so as to avoid accidents.

● Most of the normal black oil 
In the normal state of engine technology, the quality of fuel and lubricants to meet the requirements of the cases, the use of oil color gradually deepened, until the black is normal.
1 fuel combustion residues, in lubricant miscible.
2 oil at very high temperatures, the occurrence of natural oxidation.
3 oil which has a strong ability to clean oil dispersed in the oxide, resin and asphaltene dissolved or dispersed in oil.
The number of these substances, with the extension of working hours increased, the color is bound to gradually deepen black.

● If the oil in a very short period of time to deepen black, is not normal, the following aspects should identify the reasons:
1 engine when fuel is burned completely, pistons, piston rings and cylinder for wear between the large, leaking.If incomplete fuel combustion, exhaust gas into the oil tank will quickly become black thick oil.
(2) oil, whether the oil tank and oil duct has been cleaned. If not cleaned, the residues will form a new oil pollution.
3 oil level meets the requirements. High temperature, high-speed, high load engine should use oxidation stability, good quality high-grade lubricating oil additives, the use of poor quality oil will rapidly deepen oil color black.

● time cleaning the engine lubrication system
Oil use for some time, the oil will accumulate due to oxidation of many glial and metal wear debris and other impurities, when the oil put the net, if not cleaned oil and the bottom shell, the remnants of resin and asphaltene, metal shavings and other impurities, seriously polluting the quality of new lubricating, and accelerated the rate of new oil deterioration. Therefore, changing the oil, must take the oil pan and oil clean.
Cleaning methods:
1 will stop after the hot pan and coarse and fine filter in the oil released.
(2) to clean oil plus 20% of the ordinary light diesel engine oil or lubricating oil into a more dilute engine oil tank, the number of standard fuel tank capacity of 60% -80%.
3 Remove the spark plug, use the handle to shake the crankshaft 3 to 5 minutes, then wash all the oil release.
4 mounted on the spark plug, get a new oil.
5 Clean the crankcase ventilation, remove the vent pipes and valves, blow dry with compressed air after cleaning and re-installed.
Cause excessive oil consumption

● mechanical reasons:
1 piston, piston ring and cylinder wall wear too much, the gap is too large;
(2) lack of flexibility or piston ring stuck in the slot, Mifengbuyan;
3 valve and rocker arm clearance is too large, jump out the oil, worn valve guides, cylinder lubricating oil to be inhaled;
4 high pressure lubricating engine oil sump, oil into the cylinder through the exhaust gas recirculation device;
5 oil bath air filter oil tanks oil is too high, the cylinder lubricating oil to be inhaled;
6 or broken piston ring installed backwards or openings in the same side.

● oil quality reasons:
If the composition of lubricant base oil combustion too light or too broad, there will be super-consumption, should check the eligibility of its evaporation losses.