What Are the Causes of Excessive Engine Oil Consumption in Cars?
1 Answers
Reasons for excessive engine oil consumption: 1. Worn or damaged piston rings, misaligned or incorrectly installed piston rings. When piston rings wear out, their elasticity weakens, reducing the pressure on the cylinder walls and diminishing their oil-scraping function. Additionally, wear between the piston rings and ring grooves increases side and back clearances, leading to more oil leakage, especially if the oil ring is damaged, which can multiply the leakage. Furthermore, misaligned or incorrectly installed piston rings create a pathway for oil splashed onto the cylinder walls to enter the combustion chamber, significantly increasing oil consumption. 2. Excessive clearance between the piston and cylinder wall. If the fit between the piston and cylinder wall is too loose or the cylinder becomes tapered or oval-shaped, the piston rings, piston, and cylinder wall cannot seal properly. This allows splashed oil to enter the combustion chamber and burn, causing a sharp rise in oil consumption. 3. Use of low-viscosity oil. Low-viscosity oil is more prone to entering the combustion chamber and has a thinner oil film, making it easier to burn. Additionally, low-viscosity oil has a higher evaporation rate. 4. High engine speed. The higher the engine speed, the greater the centrifugal force on the crankshaft and connecting rods, which increases the amount of oil splashed onto the cylinder walls. As a result, the oil ring cannot scrape off the oil fast enough, leading to more oil entering the combustion chamber and burning.
