Gasoline Engine Oils

🛢️ Gasoline Engine Oils

🔹 What Are Gasoline Engine Oils?

Gasoline engine oils are lubricants specifically formulated for petrol (spark-ignition) engines. They reduce friction, protect engine components, and ensure smooth performance under varying temperatures and driving conditions.

⚙️ Key Functions

• Lubrication: Reduces friction between moving parts
• Cooling: Helps dissipate engine heat
• Cleaning: Prevents sludge and deposit buildup
• Protection: Minimizes wear, rust, and corrosion
• Sealing: Improves compression by sealing piston rings

🧪 Types of Gasoline Engine Oils

1. Mineral Oil

• Derived from crude oil
• Basic protection
• Suitable for older engines

2. Synthetic Oil

• Chemically engineered for high performance
• Better temperature stability
• Ideal for modern and high-performance vehicles

3. Semi-Synthetic Oil

• Blend of mineral and synthetic oils
• Balanced performance and cost

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🔢 Viscosity Grades (SAE Ratings)

Defined by the Society of Automotive Engineers:

• 5W-30 → Good for cold starts & fuel efficiency
• 10W-40 → Better for warmer climates
• 0W-20 → Used in modern fuel-efficient engines

👉 “W” stands for Winter (cold temperature performance)