This resistance to "cooking" is vital because air-cooled engines run hotter and are prone to varnish and sludge buildup. Engine oil serves not only to lubricate moving metal parts but also to dissipate heat, clean internal components, and seal combustion gases.
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Special Considerations: Oil Specifications Not all engines are created equal, and the rise of electric start mowers and advanced gearboxes has introduced new variables into the equation. The number before the "W" indicates cold flow, while the number after indicates hot viscosity.
Understanding Viscosity: The First Critical Factor Viscosity refers to the oil's resistance to flow, and this is the number on the bottle that matters most for temperature management. Selecting the correct oil for your lawn mower is the single most important maintenance decision for ensuring longevity and reliable performance.
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Using the wrong viscosity or an incorrect specification can lead to increased friction, overheating, and ultimately, catastrophic engine failure. Synthetic blends offer a significant advantage in small air-cooled engines because they resist thermal breakdown and oxidation far better than conventional alternatives.
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