Can the vehicle continue to be used if the engine oil level increases?

[Lukas]

If the engine oil level increases, the vehicle should not be driven. In such cases, usage should be stopped immediately, and the cause of the oil level increase should be inspected. The vehicle can only be used again after the issue is resolved. Below is an introduction to engine oil: Impact of increased engine oil: Excess oil can affect the operation of the catalytic converter. Additionally, high oil pressure may cause damage to seals and lead to intense agitation of the crankshaft and connecting rod big end during engine operation. This not only increases internal power loss but also results in more oil splashing onto the cylinder walls, leading to oil burning and consumption. Function of engine oil: The engine is the heart of a vehicle, containing numerous metal surfaces that move against each other. These components operate at high speeds under harsh conditions, with working temperatures reaching 400 to 600 degrees Celsius. Under such extreme conditions, only qualified lubricating oil can reduce wear on engine parts and extend their service life.

[OMaria]

Last time I went for car repair, I encountered a very typical case. A Civic owner found the engine oil was two centimeters above the maximum mark and smelled like gasoline. When the mechanic opened up the engine, it turned out the piston rings were worn out, causing gasoline to leak into the oil pan. This kind of oil dilution issue should never be taken lightly. I’ve personally seen owners who delayed repairs end up spending over 8,000 yuan on major engine overhauls. When oil gets diluted, its lubrication effectiveness drops significantly, and engine cylinder scoring is no joke. Now, during every maintenance session, I make sure to watch the mechanic check the dipstick. If any abnormality is found, I immediately inspect the crankcase ventilation valve and fuel injector seals. After all, the cost of repairing an engine could buy several barrels of top-tier engine oil.

[SanChase]

From a commuter's perspective: My colleague's hybrid SUV had a sudden increase in engine oil last winter, and the 4S shop said it was due to short-distance driving. Later, he started taking a weekly highway trip, and the oil level actually normalized. The principle is that the engine didn't heat up sufficiently, causing unvaporized gasoline to mix into the oil. However, I found through research that the oil increase caused by design flaws like Honda's 1.5T engine is more dangerous and requires replacing the piston ring assembly. If you notice emulsification on the oil cap or blue smoke during cold starts, it's safer to check the fault codes immediately.

[DylanLee]

The essence of oil dilution is the mixing of impurities: gasoline, coolant, or water vapor. Last year, I helped my cousin deal with oil emulsification in his Changan CS75. After disassembling the PCV valve, we found it was frozen shut, preventing water vapor from escaping the crankcase. It's particularly important to mention coolant leakage; the engine oil will turn a milky tea color. The most straightforward method is to take a drop of engine oil and place it on a hot metal plate. If it sizzles and emits white smoke, it's definitely mixed with coolant. Continuing to drive under these conditions may lead to bearing failure. It's recommended to check the dipstick every two weeks; if the oil level exceeds the upper limit by 5mm, it's time for maintenance.