The 2016 Haval H7, purchased in May 2017, plus a comfort package and a winter package, landed 1830,000 yuan, currently 59,100 kilometers。At the beginning of the 40,000 kilometers, I noticed that the car was burning oil. In the beginning, one liter of engine oil was required for a maintenance interval of 1,000 kilometers. But over time, the problem progressively worsened, eventually reaching the point of consuming one liter of oil per kilokilometre. I've tried replacing the PCV wastegate but to no avail.
After endoscopic examination, I found that the carbon deposits on the top of the piston and the fuel injector were very serious. Based on my understanding of piston ring seizure caused by carbon deposits, I judged that this was the main cause of the serious oil burning problem. Moreover, because Haval's GW4C20 series engine has the same design as Volkswagen's second-generation EA888, both engines have the problem of piston ring design that is easy to cause stagnation.
Faced with the problem of burning engine oil, I delved deep and looked for a solution. I went to the 4S shop and they suggested a major overhaul to replace the middle cylinder. However, considering the maintenance cost (although the insurance is out, the cylinder can be claimed, but you need to bear the cost of man-hours and materials, about 5,000 yuan) and the potential risk of depreciation, I chose other options.
By chance, I found a rider in the group who successfully treated the problem of burning engine oil with Siyoupu burning oil repair agent. Although I was skeptical about it at first, after continuing to follow his treatment process, I decided to try it with Stapu Burning Oil Repair Agent.
There are three bottles of repair agent in each group, a tank of oil in a group, and repairs are carried out while driving. Its principle is to remove carbon deposits in the oil circuit, let the repair agent penetrate into the piston ring, and remove the carbon deposits stuck in the piston ring, so as to achieve the purpose of releasing the piston ring. I have shared six tanks of oil and two engine oil repair agents, which were repaired in 2022, and it has been a year and a half now, and the experience is like this.
2+12 this combination of repairs
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After the completion of the two groups, it has been more than 1,000 kilometers since February 13 to replenish a liter of engine oil, and the usual oil position is basically fast to the lower limit, but the oil position is still in the middle line position, and I feel hopeful!The third group started (26 February) with 400ml of oil close to the limit: the change in oil was clearly visible, not as dark as before. The mileage of replenishing oil is 57,940 km.
On March 1, 2022, the third group ended, and the oil position was as follows, basically no decrease.
The third group ended with a mileage of 58,319 km. Follow-up to the fourth time when the oil is very stable, no consumption, according to the recommendations to continue to consolidate the next two sets of six tanks of oil after the completion of the direct change of new oil.
This method of Siyoupu repair agent to achieve the release of piston ring treatment and burn engine oil by cleaning carbon deposits in the oil circuit is feasible. After the repair is completed, it is necessary to use this repair agent regularly to maintain the oil circuit and prevent the formation of carbon deposits again. As long as it is properly maintained, it can basically solve the problem of burning engine oil perfectly. I have now stopped using the repair agent for a year and a half, and I have traveled 30,000 kilometers, adding two fuel repair agents every 5,000 kilometers at a time, and it is used as a fuel treasure, anyway, the daily fuel treasure is needed, and the engine oil is now very stable every time it is maintained, and it consumes half a liter for 7,000 kilometers. It is recommended to use 2+9 or 1+9** for daily maintenance. The average is less than 100 yuan, and it costs more than 100 yuan to buy a fuel treasure, and the air ring that can't be cleaned is very useful, and it can also prevent burning engine oil. I will continue to pay attention to the follow-up situation and give feedback to other riders in real time!