27/08/2025
🚘 The degree of engine oil viscosity refers to how thick or thin the oil is and how easily it flows at different temperatures. It's one of the most critical properties in engine oil, affecting lubrication, engine protection, and performance.
Viscosity is indicated by a number-letter code, like:
🔧 5W-30, 5W-40, 10W-40, etc.
Here's what it means:
🔹 First number (before the W):
This refers to cold weather viscosity (W = Winter).
A lower number means thinner oil in cold temperatures → better cold starts.
Example: 5W flows better in winter than 10W.
🔹 Second number (after the W):
This indicates the oil’s viscosity at high temperatures (100°C) — like when your engine is running hot.
A higher number means thicker oil at operating temperature → better protection at high heat.
Example: 30 is thinner than 40 at high temp.
🔧 Common Engine Oil Grades:
0W-20: Very thin, great for cold climates and fuel economy.
5W-30: Common for modern engines; good balance of cold-start performance and protection.
10W-40: Thicker; used in older engines or high-performance/high-temp conditions.
✅ Choosing the Right Viscosity:
Check your owner's manual — it specifies the ideal viscosity for your engine.
Consider your climate:
Cold climates → lower W numbers (0W, 5W).
Hot climates → higher second numbers (30, 40, 50).
Engine condition:
Older or high-mileage engines may benefit from thicker oils (like 10W-40 or 20W - 50) to reduce leaks or burning.
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Jayson M. Ricamara
Auto Technician | Lifestyle Entrepreneur
