Why Does Engine Oil Increase?

[AllieRose]

There are three main reasons for the increase in engine oil, as detailed below: 1. Oil mixing with gasoline or water: During vehicle operation, poor sealing of pistons or cylinders allows the air-fuel mixture to enter the crankcase. When temperatures drop, the gas condenses into liquid and flows back into the oil pan, increasing the oil level. At this point, water mixes into the oil. If fuel does not burn completely in the cylinders, it flows back into the oil pan, diluting the oil and reducing its performance, thereby failing to protect the engine. 2. Engine component mechanisms: The increase in oil level is related to engine component mechanisms, such as insufficient cylinder pressure or poor cylinder sealing, which reduce engine power and make starting difficult. Faulty fuel injectors causing fuel dripping or excessive fuel injection also contribute. These issues require diagnosis and repair by a professional mechanic. 3. Temperature conditions: During cold starts, a richer air-fuel mixture is needed, so fuel injectors spray more gasoline. Excess gasoline may flow back into the oil pan, generally causing oil level increase due to excessive fuel injection.