What Causes the Volkswagen Tiguan to Burn Engine Oil?

[JosephRose]

The severe engine oil burning in the Tiguan can be attributed to the following reasons: 1. Severe wear of the piston ring grooves: If the piston ring grooves are severely worn, the engine oil used to lubricate the pistons can enter the combustion chamber due to poor sealing by the piston rings and participate in combustion. 2. Damage to the valve stem seals: If the valve stem seals are damaged, the engine oil lubricating the camshaft can enter the combustion chamber through the valves and participate in combustion. 3. Fault in the ventilation system: There is an issue with the crankcase forced ventilation system. During engine operation, a small amount of high-temperature and high-pressure gas can escape from the piston rings into the crankcase. Due to the increased temperature inside the crankcase, the gas expands, and the high-temperature and high-pressure gas entering the crankcase raises the internal pressure, causing engine oil to leak from various joints and seals.