Engine Oil Grades Explained (5W30, 10W40, 0W20)
gowthami
If you’ve ever glanced at an engine oil bottle and thought what are the labels like 5W-30, 10W-40, or 0W-20, you’re not alone. These numbers are called engine oil grades, and understanding them is essential for choosing the right oil for your car.
What is actually Engine Oil Grades?
Engine oil grades specify the oil viscosity.
Viscosity = the measure of the oil being thick or thin
The grade tells you:
- How the oil flows in cold conditions
- How well it shields the engine at high temperatures
- Using the right oil grade ensures smooth starts, proper lubrication, and long engine life.
- Proper understanding of the Engine Oil Grade Format
- Most modern engine oils have grades like 5W-30.
Let’s break it down:
- The number before “W” = Cold temperature performance
- “W” = Winter
- The number after “W” = High-temperature performance
- Example: 5W-30 that is 5W - Oil flows well in cold starts and 30- Oil stays thick enough at operating temperature
Engine Oil Grades Explained One by One
1. 0W-20 Engine Oil – For New & Modern Cars
- Extremely thin oil
- Excellent cold-start flow
- Low internal friction
Good for:
- New-generation petrol cars
- BS6 engines
- Cars focused on fuel efficiency
Benefits:
- Faster cold starts
- Better mileage
- Reduced engine wear
Not suitable for older engines unless recommended by the manufacturer.
2. 5W-30 Engine Oil – Best All Rounder
- Good cold start performance
- Balanced thickness at high temperatures
Best for:
- Most modern petrol and diesel cars
- City and highway driving
- Indian climate conditions
Benefits:
- Smooth engine operation
- Good fuel efficiency
- Strong engine protection
5W-30 is the most commonly recommended engine oil grade in India.
3. 10W-40 Engine Oil – For Older & High Mileage Engines
- Thicker oil compared to 5W-30
- Stronger high temperature protection
Best for:
- Older cars
- High mileage engines
- Engines with minor wear
Benefits:
- Better sealing for worn engine parts
- Reduced oil consumption
- Improved protection under load
- May reduce mileage slightly in newer cars.
Why Choosing the Right Engine Oil Grade Matters
Using the wrong oil grade can lead to:
- Poor cold starts
- Reduced fuel efficiency
- Increased engine wear
- Overheating or sludge buildup
Correct oil grade ensures:
- Smooth start
- Optimal lubrication
- Better mileage
- Longer engine life
Engine Oil Grades vs Indian Driving Conditions
Indian roads and traffic create unique challenges:
- Frequent stop and go driving
- High ambient temperatures
- Short trips
Recommended grades for India:
- 0W-20 - New cars, BS6 engines
- 5W-30 - Most cars (best balance)
- 10W-40 - Older or worn engines
Common Myths About Engine Oil Grades
Myth: Thicker oil means better protection
Reality: Too thick oil can reduce mileage and cause poor lubrication
Myth: One oil grade fits all cars
Reality: Each engine is designed for a specific viscosity
Conclusion
Knowing different grades of engine oil will definitely help you decide on the maintenance work that is most suitable. Using the right grade will keep the engine running smoothly, increase the mileage and make the engine last longer
Deciding on the correct premium engine oil to use is basically the single most crucial decision you make in the whole process of keeping your car healthy. Premium oils have been given a formulation with superior additives that provide great protection against friction, minimize sludge and deposits, and help the engine to take and retain the right viscosity at any temperature and under any driving condition.
About Us
Pakelo India is an online platform dedicated to selling premium car engine oil and bike engine oil . We offer a complete range of high performance and virgin engine oil solutions for everyday driving and performance needs. Our products are engineered in Italy and trusted worldwide for superior engine protection. With Pakelo India, choosing the best engine oil becomes simple, reliable and performance driven.
