The number preceding the "W" indicates cold-weather performance—the lower the number, the easier the oil flows when temperatures drop. Synthetic oils, on the other hand, are chemically engineered to have uniform molecular structures.
Correct Oil For Small Engine: Choosing the Right Viscosity
This single-grade oil provides reliable protection in moderate climates but thickens significantly in cold weather, making seasonal starting difficult. This consistency provides superior lubrication, better resistance to oxidation, and a longer functional life between changes.
Decoding Viscosity: The SAE Rating System Viscosity is the measure of an oil’s resistance to flow, and it is the primary factor in determining whether your engine receives adequate lubrication. Because of this thermal stress, they require a formulation specifically designed to maintain a stable viscosity film.
Correct Oil For Small Engine: Choosing the Ideal Viscosity
The number after the "W" indicates the viscosity at operating temperature, ensuring the oil does not become too thin when the engine heats up. Small air-cooled engines, typically found in residential mowers, operate at extremely high RPMs and generate significant heat compared to automotive engines.
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