Should Engine Flush Be Used Before an Oil Change?

[Sylvia]

Engine flush should be used before an oil change. When changing the oil, purchase a bottle of engine flush additive, add it to the engine, let it idle for a few minutes, then drain the old oil before adding new oil. Otherwise, residual oil can reduce the effectiveness of synthetic oil. Engine oil, also known as engine lubricant (English name: Engine-oil), serves multiple functions for the engine: lubrication and friction reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, as well as shock absorption and cushioning. Below are the key functions of engine oil: 1. Friction Reduction: A sufficiently thick oil film separates the surfaces of moving parts, thereby minimizing wear. 2. Sealing: Engine oil forms a seal between piston rings and pistons, reducing gas leakage and preventing contaminants from entering. 3. Rust Protection: Lubricant adheres to part surfaces, shielding them from water, air, acidic substances, and harmful gases. 4. Shock Absorption: When cylinder pressure surges suddenly, intensifying the load on pistons, piston rings, connecting rods, and crankshaft bearings, the lubricant distributes this load, cushioning the impact. 5. Cleaning: High-quality oil carries away carbon deposits, sludge, and metal wear particles from engine components back to the oil pan, flushing contaminants from part surfaces through oil circulation.