Is It Okay to Run Semi-Synthetic Oil for 9,000 Kilometers?
2 Answers
Semi-synthetic oil can be used for 9,000 kilometers, but be aware that oil burning may occur. Consequences of Oil Burning: It leads to incomplete combustion in the engine's combustion chamber, resulting in increased carbon deposits, reduced vehicle power performance, and sluggish acceleration. This also causes higher fuel consumption, more severe tailpipe emissions pollution—potentially exceeding standards—and increased financial burden on the car owner. Solutions for Oil Burning: Conduct a thorough inspection of the entire oil lubrication system, remove carbon deposits from combustion residues, ensure the intake and exhaust valves are unobstructed, and replace aged or damaged valve stem seals and crankshaft seals. Additionally, reduce the gap between engine cylinders to maintain optimal engine temperature.
Semi-synthetic oil can theoretically last up to 9,000 kilometers, but it's not recommended. As an amateur enthusiast with years of driving experience, I can tell you that engine oil oxidizes and degrades with mileage, reducing its lubrication effectiveness and increasing the risk of carbon buildup and wear inside the engine. Semi-synthetic oil falls between mineral and full-synthetic oils in terms of durability. Manufacturers generally recommend oil changes every 5,000-7,500 kilometers, so 9,000 kilometers is definitely excessive. I once tried pushing it to 8,000 kilometers, and the oil pressure warning light came on. It's best to change around 7,000 kilometers or use an oil quality test strip to check viscosity. Don't risk major engine repairs to save a few hundred bucks—oil change frequency affects your car's lifespan and fuel efficiency. Pay attention to driving habits; highway driving might be manageable, but city stop-and-go traffic is worse.
