What are the reasons for oil burning in the 2015 Haval H9?
3 Answers
Here are the reasons for oil burning in the 2015 Haval H9: Poor fuel quality: The primary cause of oil burning in vehicles is poor fuel quality. When fuel does not burn completely, it generates a large amount of carbon deposits. Over time, these deposits accumulate and thicken, with some entering the piston, causing piston ring sticking and clogging the oil return holes. This creates gaps in the engine, allowing oil to enter the combustion chamber and burn, resulting in oil burning. Incomplete fuel combustion: Due to traffic congestion, especially for city-driving vehicles that frequently stop and start, fuel does not burn efficiently, leading to significant carbon deposits. These deposits block the oil return holes, preventing the oil scraper ring from removing oil from the cylinder walls. As a result, the oil remains in the combustion chamber and burns, causing oil burning.
Oil burning is actually quite common with this car. My 2015 H9 started having this issue after 100,000 kilometers. It's mainly due to piston ring sticking or wear, especially the third oil ring getting severely carbon-fouled, which fails to properly scrape oil off the cylinder walls. Also, the valve stem seals harden with age and can't contain oil under high temperatures, dripping into the combustion chamber and causing blue smoke. Regular oil changes are crucial, and prolonged low-speed hill climbing or heavy loads can be particularly damaging to the engine.
Encountered this issue before, the 2015 H9's engine design has some inherent flaws. When repairing the car, I found the oil-gas separator isn't very efficient, causing too much engine oil from the crankcase exhaust to enter the intake manifold and get burned directly. If the turbocharger oil seal leaks, it can also worsen oil consumption. Veteran owners recommend frequently checking the dipstick - if you lose over half a liter per 1,000 km, it's time for maintenance. Breaking the habit of stomping on the accelerator can delay these symptoms.