
vehicles do not consume much engine oil. Engine oil specifications: Specifications include two parts: classification and viscosity grade. Engine oil specifications usually indicate viscosity and quality. The viscosity of lubricating oil is mostly identified using SAE grades. Functions of engine oil: Engine oil functions include lubricating pistons and cylinders, assisting in cooling, sealing to prevent leaks, and preventing excessive wear on parts. A sufficiently thick oil film separates the surfaces of relatively sliding parts, thereby reducing wear. Engine oil can form a seal between the piston rings and pistons, reducing gas leakage and preventing external contaminants from entering. Precautions: When adding engine oil, the amount should be slightly below the standard mark. Excessive oil can increase the rotational resistance of the crankshaft, reduce the engine's output power, and cause excess oil to enter the combustion chamber and participate in combustion, leading to oil burning, blue smoke emission, and increased fuel consumption.

I've run an auto repair shop for eight years, specializing in vehicles. Some Nissan engines do have oil consumption issues, particularly older VQ series and certain 1.6T engines. The most common causes are poor piston ring sealing, carbon buildup blocking oil return holes, or aged valve stem seals. Models like the Qashqai and X-Trail from a decade ago often develop this problem after 100,000 km if maintenance is neglected. I recommend checking the dipstick every 5,000 km - if oil consumption exceeds half a liter, be alert. Early detection may allow solutions like switching to higher viscosity oil or carbon cleaning, but severe cases require engine overhaul. Don't believe additives can permanently fix this - I've seen many engines with cylinder scoring from such attempts, requiring 7,000-8,000 RMB repairs. Regular air filter changes and quality oil can delay the issue.

My Teana has run 150,000 kilometers and started burning oil last year. The most obvious symptom was blue smoke during cold starts, requiring 1 liter of oil top-up every 3,000 km. Mechanics found hardened valve stem seals and carbon-stuck piston rings during disassembly. They said my frequent short-distance driving combined with delayed oil changes caused incomplete combustion. After replacing with upgraded seals and wave-style rings paired with 5W30 high-viscosity oil, oil consumption improved significantly. I now strictly follow 5,000-km minor intervals, regularly check air filters and PCV system, and oil consumption has returned to normal range. Actually, oil burning isn't terrifying - the key is timely repairs.

Oil burning in some models has been a long-standing issue. For example, early Tiida 1.6 and Sylphy 2.0 models had engine design flaws with improperly designed piston rings. Blue smoke during cold starts and abnormal oil consumption are telltale signs. You can check for black oil stains on the inner walls of the exhaust pipe or see if frequent oil top-ups are needed between maintenance intervals. If symptoms appear, try replacing the PCV valve first - if that doesn't work, the piston assembly needs inspection. Regular precautions include minimizing short trips and avoiding prolonged idling.

My friend's second-hand Bluebird had issues with burning oil. The main symptoms were a pungent burnt smell from the exhaust and reduced power. After diagnosis at the auto repair shop, the entire piston assembly needed replacement. The mechanic advised that when a used Nissan, special attention should be paid to the engine condition, especially for cars over ten years old. You can inspect cylinder wall scratches with a borescope or observe the exhaust color during a cold start. The repair cost over 4,000 yuan, and he now uses full synthetic oil and regularly cleans the throttle body. It's recommended to check the spark plug carbon buildup when inspecting the engine oil.

The process of dealing with my Livina's oil burning issue was as follows: First, I measured the cylinder pressure to confirm it wasn't a valve problem, and determined it was a damaged piston ring. The repair involved replacing the piston ring set with an improved version featuring a wave ring, and the valve stem seals were also replaced. The entire process took three days, costing 6,000 yuan for parts and labor. It's been two years now, and everything is running normally. I insist on using full synthetic oil with a 40 viscosity. I've also developed the habit of regularly checking the color inside the exhaust pipe to ensure there's no black sludge. The most profound lesson learned is not to skimp on quality by using inferior engine oil, and the importance of shortening the interval.


