What are the symptoms of a car with excessive engine oil?

[DeAsher]

The symptoms of a car with excessive engine oil are: 1. Crankcase explosion; 2. Blue smoke from the engine exhaust pipe; 3. Piston ring sticking, fuel injector clogging; 4. Reduced engine power output; 5. Engine oil leakage. The functions of engine oil are: assisting engine lubrication and wear reduction, cooling and temperature reduction, sealing and leak prevention, rust and corrosion prevention, shock absorption and buffering. Engine oil can be selected based on usage conditions and divided into: 1. Diesel engine oil: chosen according to the total mechanical and thermal load of the car engine, and the severity of engine operating conditions; 2. Gasoline engine oil: selected based on the severity of engine operating conditions, additional devices in the car's intake and exhaust systems, and the production year.

[VonChloe]

Recently, my car also experienced an issue with excessive engine oil. The symptoms were that when checking the dipstick, the oil level was far above the normal upper limit—usually it should be at the midpoint, but now it's almost overflowing. The oil smells like gasoline, as if it's mixed with fuel. When driving, the engine feels sluggish, accelerating much slower than usual, and it's particularly strenuous when going uphill. Fuel consumption has also increased slightly, and the engine noise has become louder, with a constant annoying hum. This is especially noticeable during cold starts, and it gets worse in winter. Short trips that don't allow the engine to fully warm up can easily cause this. I immediately went to change the oil, and the mechanic said that if left unchecked for too long, internal engine wear would worsen, and it could also damage the seals. He recommended regularly checking the dipstick and addressing any abnormalities as soon as they're noticed.

[DeIan]

Last year, my car experienced noticeable symptoms of oil dilution: during the oil change, the oil volume was significantly higher than normal, and the texture was thin like water, unlike its original viscosity. When checking the dipstick, the oil level was abnormally high. After starting the engine, there was a strange rattling sound, and the power was insufficient—hills that I could usually climb with a light press of the accelerator now required extra effort. Fuel consumption increased from 8 liters to 10 liters, and the engine warning light occasionally flashed as a reminder. Driving in summer was manageable, but the issue worsened after short trips in winter. After taking it to the repair shop for inspection, they confirmed that fuel had mixed into the engine oil, and prolonged neglect could lead to lubrication failure and component damage. If you notice these signs, don’t delay—timely maintenance can save you from costly repairs.

[VanHope]

Symptoms of engine oil dilution include rising oil level on the dipstick and a strong gasoline odor in the oil, indicating possible fuel leakage into the oil pan. From personal experience, insufficient engine lubrication causes acceleration hesitation and significantly increased noise, with a disturbing humming sound while driving. Fuel consumption rises sharply, with at least a 10% increase in average consumption, especially noticeable during short trips and in cold weather. Regular inspections can prevent major issues and avoid worsening internal engine friction. Early intervention is crucial, as prolonged neglect may lead to accelerated wear or excessive emissions.

[LaCharles]

Last week, my car's oil dilution symptoms became glaringly obvious: the dipstick showed excessively high oil levels, with the oil appearing thinner and carrying a gasoline odor; engine power dropped noticeably, struggling with uphill climbs and acceleration; fuel consumption increased, accompanied by irritatingly loud engine noise. I also observed some black smoke from the exhaust, indicating incomplete combustion. This issue is more prone to occur during short winter drives. Left unaddressed, degraded lubrication could damage internal engine components. After promptly changing to fresh oil, normal operation resumed. I recommend regularly monitoring oil levels for early detection and action to protect your vehicle.