After the initial break-in, change the oil at least once per season, or every 50 hours of operation, whichever comes first. Always change the oil when the engine is warm, as this allows old oil to drain more completely, carrying with it the contaminants that have settled in the crankcase.
Cold Weather Oil Starting Performance and Engine Protection
Conversely, in extreme desert heat, a 15W-40 might be considered to maintain a stable film thickness. For most small air-cooled engines, 10W-30 is the universal standard, as it provides adequate protection across a wide range of temperatures encountered in outdoor power equipment.
Conventional oil is refined from crude oil and contains impurities; it is effective but tends to break down faster under the high stresses of a small engine. Engine oils are labeled with a code such as 10W-30 or 5W-30.
Cold Weather Oil Starting Performance and Engine Protection
The Role of Additives in Engine Longevity Modern engine oil is a complex chemical cocktail, and the additives are just as important as the base oil. If you are operating the mower in freezing temperatures, a 5W-30 oil is highly recommended because its low-temperature fluidity ensures the engine is protected the moment you turn the key.
More About Oil for lawn mower
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