What Do Engine Oil Numbers Mean? How to Choose the Right One for Your Car?

Last time we talked about engine oil types — today, let’s look at engine oil grades!

Many car owners get confused when they see numbers like 0W‑20 or 5W‑30.

Don’t worry — it’s actually super simple. Here’s a 1‑minute explanation! 😎✨

🔍 What Do the Engine Oil Numbers Mean?

🔹 The first number + W (e.g., 0W, 5W)

👉 Indicates low‑temperature viscosity, meaning how easily the oil flows during a cold start.

The smaller the number, the better it flows in cold conditions.

✔️ In Hong Kong, 0W and 5W are the most common.

🔹 The second number (e.g., 20, 30, 40)

👉 Indicates high‑temperature protection.

The larger the number, the thicker and more heat‑resistant the oil is at operating temperature.

✔️ 30 is most common.

✔️ 40 is usually used for turbocharged or high‑load engines.

How to Choose the Right Engine Oil?

✔️ 1. Follow your owner’s manual (MOST important!)

Every car model has a manufacturer-recommended viscosity.

Stick to it — you can’t go wrong.

✔️ 2. Consider your car’s condition

🚗 Newer cars → Follow manufacturer specs (commonly 0W‑20 / 5W‑30)

🚗 High‑mileage cars → Consider slightly thicker oil (30 / 40) for better protection

🚗 Turbocharged cars → Usually 5W‑30 or 5W‑40

✔️ 3. Match your driving habits

🚦 Frequent traffic / short trips → Better with higher heat resistance (30 / 40)

🛣️ Daily long-distance driving → Manufacturer‑recommended oil is enough

⛽ Want better fuel efficiency? → Choose 0W‑20 or 5W‑30

⭐ Remember:

👉 Smaller number before “W” = smoother cold start

👉 Bigger second number = stronger high‑temperature protection

DCH Motor Service Centre is now offering New Year maintenance offers under the All‑Round Maintenance Plan, using genuine Shell Helix Ultra engine oil—up to 55% OFF. Book your service now!

📱 WhatsApp us for maintenance enquiries: https://bit.ly/aio_general

🌐 Learn more about our All‑Round Maintenance Plan:

https://www.dchmsc.com/regular-maintenance-plan