What is No. 30 Engine Oil?

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Mechanical oil grades are determined based on their kinematic viscosity at 50°C. The kinematic viscosity of No. 30 mechanical oil at 50°C ranges from 27 to 33 mm²/s, with a pour point of -10°C and a flash point of 180°C. Mechanical oils are categorized into seven grades from 10 to 70, with higher numbers indicating greater viscosity. The SAE lubricant viscosity classification for summer oils includes grades 20, 30, 40, and 50, where higher numbers denote higher viscosity and suitability for higher maximum temperatures. Below are specific details about engine oil: 1. Mineral Oil: Derived from crude oil, mineral oil is typically low-cost but oxidizes more easily due to its mineral base. Various imported additives are included, and its service life is approximately six months. 2. Semi-Synthetic Oil: Although more expensive to refine, it offers excellent oxidation resistance, making it a high-quality long-lasting oil with a service life of about twelve months. Considering the balance between price and quality, semi-synthetic oil has the widest range of applications. 3. Full Synthetic Oil: This is chemically synthesized oil that can maintain lubrication even when the base oil deteriorates.