What are the reasons for oil burning in the Q7?
2 Answers
Here are the specific reasons for oil burning in the Q7: 1. Worn valve seals: The valves are designed to prevent oil from leaking into the combustion chamber, but over time, they can wear out or age. Severe wear can affect the sealing performance of the valves, making oil burning more likely. 2. Excessive piston clearance: With prolonged use of the vehicle, carbon deposits from incomplete combustion can accumulate on the piston rings. If not cleaned for a long time, this can widen the gap between the piston rings and the cylinder block, allowing oil to enter the combustion chamber and cause oil burning. In severe cases, it may even lead to engine seizure. 3. Driving habits: Frequent rapid acceleration and prolonged high-speed driving can easily damage the lubricating oil film, leading to poor engine lubrication and wear on certain components, which also increases the likelihood of oil burning. 4. Excessive oil level: If the oil level is too high and exceeds the maximum mark, the excess oil can easily enter the combustion chamber (due to excessive internal pressure) and form gummy carbon deposits.
I encountered the issue of excessive oil consumption during long-distance drives in my Audi Q7, which is typically caused by aging internal engine components. For instance, worn piston rings can allow oil to seep into the combustion chamber. My friend's car was repaired and found to have oil leakage due to failed valve seals, a problem particularly common in older vehicles with over 100,000 kilometers. Additionally, a poorly sealed turbocharger can also lead to oil ingress, which is especially noticeable when blue smoke is emitted from the exhaust. Preventive measures include regularly checking the oil dipstick for declining oil levels, consistently using high-quality oil for changes, and avoiding prolonged high-RPM driving. Addressing any abnormalities early through repairs can save significant costs.
