Why Engine Oil Needs to Be Changed Regularly
Release Time:
Jun 01,2026
Why Engine Oil Needs to Be Changed Regularly
Gasoline engine oil must be replaced regularly because it continuously ages, deteriorates, and becomes contaminated, eventually losing its ability to protect the engine. The specific reasons are as follows:
High-Temperature Oxidation and Deterioration
The high combustion chamber temperatures in gasoline engines cause the oil to oxidize over time, thicken, and form sludge and varnish. This reduces its fluidity, impairing proper lubrication of moving parts.
Contamination by Impurities and Debris
Carbon deposits from combustion, unburned fuel, airborne dust, and metal particles from worn components all mix into the oil. These contaminants accelerate part wear and can easily clog oil passages and filter screens.
Depletion of Additives
Additives in engine oil—such as anti-wear, detergency, anti-foaming, and rust-inhibiting agents—are gradually consumed during use. Once depleted, the oil’s overall protective performance significantly declines.
Fuel Dilution
During cold starts or short trips, unburned fuel may seep into the crankcase, diluting the oil and reducing its viscosity. This severely compromises lubrication and load-carrying capacity.
Reduced Sealing and Cooling Efficiency
Engine oil also plays a role in heat dissipation and piston ring sealing. As it ages, these functions weaken, increasing the risk of engine overheating, reduced power output, and higher fuel consumption.
Recommended Change Intervals (General Gasoline Engines / Small Garden Machinery)
Two-stroke gasoline engines: Oil is mixed with fuel at a specified ratio and should be changed whenever refueling; there is no separate oil reservoir.
Four-stroke gasoline engines (lawn mowers, chainsaws, water pumps, agricultural machinery, etc.): Change oil after 5–10 hours for new engines; under normal operation, change every 25–50 hours. In harsh conditions (high loads, dusty environments), shorten the interval accordingly.
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