Does driving 12,000 kilometers with the same engine oil have any impact?
2 Answers
Fully synthetic engine oil can theoretically be used for 12,000 kilometers. Mineral oil: Mineral oil is the residue left after gasoline and heavy oil are extracted from petroleum. Although mineral oil is a natural oil, it contains more impurities compared to semi-synthetic and fully synthetic oils. It is cheaper but offers poorer lubrication for the engine and has a shorter service life. Semi-synthetic oil: Semi-synthetic oil is a middle ground between mineral oil and fully synthetic oil. It contains a large amount of anti-corrosion additives to enhance the oil's stability and high oxidation resistance. Fully synthetic oil: Among these three types of engine oils, fully synthetic oil is the highest in quality and durability, and also the most expensive. Generally, it can be used in passenger cars for 10,000 to 12,000 kilometers without deteriorating.
As someone who frequently handles vehicle maintenance, I know that running engine oil for 12,000 kilometers can have significant consequences. The generally recommended oil change interval is around 5,000 to 10,000 kilometers, depending on the oil type—for instance, synthetic oil can last longer. However, exceeding 12,000 kilometers causes the oil to degrade and deteriorate. It loses its lubricating properties, becomes thinner and dirtier, leading to increased internal engine friction and wear on components like piston rings or bearings. This can result in higher fuel consumption, reduced power output, and long-term carbon buildup. During inspections, I often encounter this issue and recommend immediately stopping to check the oil condition—feel its viscosity by hand or use a test strip to check its color. If it appears black or contains impurities, replace the oil immediately and perform maintenance to avoid costly engine overhauls. Regular maintenance is the most cost-effective and worry-free approach; don’t risk pushing it too far.
