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What Causes Oil in the Intake Pipe of the Haval H6?

2 Answers
MacOlivia
07/29/25 11:06pm
Haval H6 intake pipe has oil due to a prolonged imbalance between the intake pressure and the pressure inside the turbocharger bearing housing, which causes the oil in the turbocharger to leak into the compressor through the seals under the pressure difference. Additionally, if the engine oil is overfilled, it will inevitably increase the oil content in the crankcase ventilation system, leading to oil entering the intake pipe through the crankcase ventilation system. The Haval H6 is the flagship model of the Haval brand, available in two powertrain versions: 1.5GDIT and 2.0GDIT with a wet 7DCT. In terms of body dimensions, the Haval H6 measures 4640mm in length, 1825mm in width, 1690mm in height, with a wheelbase of 2680mm.
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LeClayton
08/16/25 1:08am
Oil in the intake pipe is quite common on the Haval H6. As an experienced owner, I've been through this—it's mainly caused by internal engine wear, such as aging piston rings or a faulty PCV system, allowing oil to enter the intake pipe. Oil buildup inside can make the intake pipe greasy, affecting airflow into the cylinders. Incomplete combustion leads to sluggish performance, increased fuel consumption, and even blue smoke, damaging emission components. Don’t take it lightly, especially for high-mileage vehicles, which are more prone to issues. My previous car ended up needing an engine overhaul due to neglect. First, check if the oil dipstick shows abnormal consumption—if it loses half a liter per 1,000 km, something’s wrong. Get the PCV valve or cylinder compression tested at a repair shop ASAP to prevent bigger problems and ensure peace of mind.
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