In very hot climates or for newer overhead valve engines, a 15W-40 may be recommended to handle the additional thermal stress. A higher number means the oil is thicker at operating temperature, which can be beneficial for engines under heavy load or high ambient heat, though it may slightly reduce fuel economy.
Step-by-Step Briggs Stratton Oil Change Guide
Foam inhibitors are also crucial, as the churning action of the crankshaft can whip air into the oil, reducing its lubricating effectiveness. It meets the necessary API (American Petroleum Institute) service ratings, such as SJ, SL, or SM, which ensure the proper levels of detergents and anti-wear additives are present.
These conditions demand lubrication that can maintain a stable viscosity, provide consistent film strength, and resist thermal breakdown. Conversely, the number after the "W" indicates the oil's thickness at 210°F (100°C).
Step-by-Step Briggs Stratton Oil Change Guide
This multi-grade designation ensures the oil is fluid enough for a cold start—providing instant lubrication to protect the engine during the most stressful moment—while thickening sufficiently at operating temperature to maintain a strong oil film. Decoding the Specifications: SAE Viscosity Viscosity refers to the oil's resistance to flow, and it is the most critical number on the label.
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