It is frequently recommended for air-cooled and air/oil-cooled engines, which are common in classic and adventure-style motorcycles. Wet Clutch Considerations Unlike automotive engines, many motorcycles utilize the transmission oil to actuate the clutch plates, meaning the oil is directly involved in the engagement and slipping of the clutch.
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The "10" indicates the oil's flow characteristics in cold conditions, specifically its resistance to thickening when temperatures drop, while the "40" refers to its thickness or resistance to shear stress at the high operating temperatures found within a running engine. The 40-grade designation indicates that this oil has a high viscosity index, meaning it resists thinning when heated.
Understanding the 10W-40 Viscosity Grade The Society of Automotive Engineers (SAE) viscosity rating system is designed to communicate how an oil performs under varying thermal conditions. These engines generate significant heat and do not benefit from the additional cooling provided by a liquid coolant system, making a stable, high-viscosity oil crucial.
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JASO (Japanese Automotive Standards Organization) certification ensures that the oil’s friction characteristics are suitable for wet clutches, preventing clutch slippage and ensuring smooth power delivery. During cold starts, engine oil behaves like a thick syrup, and if the lubrication is delayed, it can lead to increased wear on pistons, bearings, and the gearbox.
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