If you’ve ever stood in an auto parts store staring at shelves of oil bottles wondering “what engine oil does my car need?”—you’re not alone.
Choosing the correct engine oil is one of the most important parts of car maintenance, yet it’s also one of the most confusing.
Using the wrong engine oil can reduce performance, lower fuel economy, and even cause long-term engine damage. In this guide, we’ll break it all down in simple terms so you know exactly which engine oil your car needs.
Find Your Engine Oil
Use our engine oil checker tool above to instantly find what engine oil your car needs by registration number. Can’t find your make and model? Let us know in the comments.
Why Choosing the Right Engine Oil Matters
Engine oil does more than just lubricate your engine. The correct engine oil helps to:
- Reduce engine wear
- Keep engine parts clean
- Improve fuel efficiency
- Control engine temperature
- Extend engine life
Using the wrong oil viscosity or oil type can lead to poor lubrication, sludge buildup, and increased engine wear.
Check Your Owner’s Manual First
The fastest way to answer “what engine oil does my car need?” is to check your car’s owner’s manual.
Your manual will tell you:
- The recommended oil viscosity (for example 5W-30 or 0W-20)
- The oil specification (such as ACEA, API, or manufacturer approvals)
- Whether synthetic oil is required
If you don’t have the manual, most manufacturers provide digital versions online.
Understanding Engine Oil Viscosity (5W-30, 0W-20, etc.)
One of the most searched questions is “what does 5W-30 engine oil mean?”
Oil viscosity refers to how thick or thin the oil is:
- 5W = how the oil flows in cold temperatures
- 30 = how thick the oil is when the engine is warm
Common engine oil viscosities include:
- 0W-20
- 5W-20
- 5W-30
- 10W-40
- 5W-40
Modern cars usually require low-viscosity engine oil like 0W-20 or 5W-30 for better fuel economy and engine protection.
Synthetic vs Conventional Engine Oil
Another common question is “should I use synthetic or regular engine oil?”
Synthetic Engine Oil
- Better performance in extreme temperatures
- Longer oil change intervals
- Cleaner engine operation
- Often required for modern engines
Conventional Engine Oil
- Cheaper upfront
- Suitable for older vehicles
- Shorter oil change intervals
Most modern cars recommend or require fully synthetic engine oil, especially turbocharged and high-performance engines.
What Engine Oil Does My Car Need by Car Type?
Petrol Cars
Most petrol cars use 5W-30 or 0W-20 synthetic engine oil, depending on the engine and age of the vehicle.
Diesel Cars
Diesel engines often require:
- 5W-30 diesel engine oil
- 5W-40 fully synthetic oil
To handle soot and higher combustion pressures, diesel oil needs to adhere to certain regulations.
Hybrid Cars
Hybrid vehicles usually require low-viscosity engine oil like 0W-20 to maximize fuel efficiency.
High-Mileage Cars
If your car has over 75,000 miles, consider high-mileage engine oil, which contains additives designed to protect older engines and reduce oil leaks.
Manufacturer Oil Specifications Matter
Many car brands require oil that meets specific manufacturer standards, not just the correct viscosity.
Examples include:
- VW 504.00 / 507.00
- BMW Longlife-04
- Ford WSS-M2C913-D
- Mercedes-Benz MB 229.5
Always match both the oil viscosity and manufacturer approval.
How Often Should I Change My Engine Oil?
Oil change intervals depend on:
- Engine oil type
- Driving conditions
- Vehicle age
Typical oil change intervals:
- Conventional oil: every 5,000 miles
- Synthetic oil: every 7,500–10,000 miles
Check your service schedule for exact recommendations.
Common Engine Oil Mistakes to Avoid
- Using the wrong oil viscosity
- Mixing different oil types
- Ignoring manufacturer specifications
- Skipping oil changes
- Assuming “thicker oil is better”
These mistakes can lead to engine damage and costly repairs.
Quick Checklist: What Engine Oil Does My Car Need?
Before buying engine oil, make sure you know:
- Correct oil viscosity
- Synthetic or conventional oil
- Manufacturer oil specification
- Engine type (petrol, diesel, hybrid)
- Mileage of your vehicle
Final Thoughts
So, what engine oil does my car need? The answer depends on your vehicle’s engine, age, and manufacturer requirements. Always use the oil specified in your owner’s manual and avoid guessing — your engine will thank you.
Choosing the right engine oil is one of the easiest and cheapest ways to keep your car running smoothly for years to come.
FAQ – Engine Oil
Q: How often should I check my engine oil?
A: Most car manufacturers recommend checking your engine oil at least once a month or before long trips. Regular checks help prevent engine wear and ensure your car runs smoothly.
Q: Can I use any engine oil in my car?
A: No. Using the wrong type or viscosity can damage your engine and may void your warranty. Always use the recommended oil for your make and model. You can use our engine oil tool above to find the correct oil.
Q: What happens if I use too little or too much oil?
A: Too little oil can cause increased engine wear, overheating, or serious damage. Too much oil can lead to foaming, leaks, and pressure issues. Always follow the recommended capacity.
Q: What is the difference between synthetic and semi-synthetic oil?
A: Fully synthetic oils offer better protection at high temperatures and last longer, while semi-synthetic oils are a mix of natural and synthetic and are usually more affordable. Check your car manual for the correct type.
Q: How do I know which engine oil is best for my car?
A: The best engine oil depends on your car’s make, model, year, and engine type. Use our tool above or consult your manufacturer’s recommendations for the correct type and litres.
Q: Can the wrong engine oil affect fuel economy?
A: Yes. Using an incorrect oil viscosity can increase friction, reduce engine efficiency, and lower fuel economy. Choosing the right engine oil helps your car run smoothly and saves fuel.
