Difference Between 30 and 40 Engine Oil
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The differences between 30 and 40 engine oil lie in their fluidity, engine noise characteristics, oil consumption rates, and stability. Below are detailed explanations of these differences: Fluidity Difference: 30-weight oil has better fluidity than 40-weight oil, which helps reduce fuel consumption and enables faster heat dissipation for the engine. Engine Noise Difference: For older vehicles, using 30-weight oil may result in slightly louder engine noise compared to 40-weight oil. Oil Consumption Difference: For engines that strictly require 40-weight oil, using 30-weight oil may lead to higher-than-normal oil consumption (commonly referred to as oil burning). Stability Difference: 40-weight oil maintains better oil stability than 30-weight oil under extremely high engine temperature conditions.