Why Does Audi Cars Burn Engine Oil?
2 Answers
Here are the reasons why Audi cars burn engine oil: 1. Negative Pressure Engine Design: Most automobile manufacturers design their engine crankcases with positive pressure, meaning they appropriately control the exhaust of internal engine gases, maintaining a certain pressure inside the crankcase. However, Audi models feature engines with a negative pressure design. During engine operation, the crankcase is in a vacuum state, causing excessive crankcase exhaust gases to enter the engine's intake system. While expelling these exhaust gases, some atomized engine oil within the crankcase also enters the intake manifold along with the exhaust, leading to higher engine oil consumption. 2. Engine Carbon Deposits: Due to the difference in fuel quality between domestic and international standards, a large amount of carbon deposits can easily form in the combustion chamber during engine operation. Carbon deposits are the root cause of various engine problems. They accumulate in the piston grooves, causing the piston rings to stick together. This prevents the piston rings from sealing completely, and the 'stuck' piston rings significantly reduce their oil-scraping and sealing capabilities. Additionally, sludge can clog the oil return holes, preventing engine oil from returning normally, which increases oil consumption and results in the phenomenon of Audi cars burning engine oil.
The other day at the 4S shop, I saw an Audi A6 with its engine disassembled, and the piston rings were stuck, causing obvious oil burning. German cars are particularly prone to three issues after prolonged use: the rubber in the valve stem seals hardens with age, allowing oil to seep into the combustion chamber under high temperatures; the turbocharger bearing seals wear out, letting oil directly enter the intake pipe; and the most troublesome issue is carbon buildup causing the piston rings to stick, preventing them from effectively scraping oil off the cylinder walls. If you see blue smoke during a cold start, it's likely a seal problem, whereas blue smoke during rapid acceleration often indicates turbo oil leakage. I once saw a Q5 burning a liter of oil every thousand kilometers, and upon disassembly, the oil rings were completely clogged with carbon deposits. It's advisable to check the oil dipstick monthly—if consumption exceeds 0.5 liters per thousand kilometers, it's time for a repair.
