How to Convert a Petrol Car into CNG: A Complete Guide30 July 2025
As fuel prices continue to rise and environmental concerns grow, many car owners are considering cleaner and more cost-effective alternatives. One of the most popular options in India is converting a petrol-powered car to CNG (Compressed Natural Gas). But how does the process work? Is it suitable for all vehicles? What are the costs, pros, cons, and legal requirements?
In this comprehensive guide, we’ll cover everything you need to know before making the switch – from choosing the right CNG kit for car, understanding the installation process, and the effect on your insurance, to the pros and cons of switching to CNG.
Can We Convert Petrol Car to CNG?
Yes, converting a petrol car to CNG is possible and quite common in India. Whether it’s a hatchback, sedan, or even an SUV, most petrol engines can be retrofitted with a certified CNG conversion kit.
However, before proceeding, it’s important to:
- Check your car’s compatibility with CNG systems.
- Choose a government-approved CNG kit with right type of CNG kit.
- Use an authorized installer for safety and legal compliance.
- Get the conversion updated on your vehicle registration certificate (RC).
How to Fit a CNG Kit in a Petrol Car: Step-by-Step
Here’s how the CNG conversion process typically works:
1. Assessment of Compatibility
Some newer petrol engines, especially BS6 or turbocharged variants, may not be ideal for CNG kits. Always consult a certified installer before proceeding.
2. Choosing the Right CNG Kit
There are two main types of kits:
- Venturi kits – Simpler and cost-effective, ideal for older carburetor-based engines.
- Sequential kits – More advanced, designed for fuel-injected engines. These offer better fuel efficiency and smoother operation.
Ensure the kit is approved by ARAI or equivalent certification bodies. For better long-term performance, always opt for high-quality kits from the best CNG kit manufacturers of India like MIJO AUTO GAS.
3. Professional Installation
Get your kit installed by a certified service center. Proper installation includes:
- High-pressure cylinder
- Regulator
- Fuel injectors
- Wiring and safety components
4. RTO Approval
After installation, you must visit your local RTO to:
- Update your RC with the new fuel type
- Get the CNG endorsement
- Ensure legal compliance for insurance and resale
5. Insurance Update
Notify your insurer and update your policy to cover the CNG kit. More on this below.
Can an Automatic Petrol Car Be Converted to CNG?
Yes, automatic petrol cars can be converted to CNG, but extra caution is required. Since automatic transmissions are more complex, improper conversion can lead to performance issues or gear lag.
Pro tip: Choose an experienced CNG installer who has previously worked on automatic vehicles, and consider using a sequential injection kit for better compatibility.
Understand the Different Types of CNG Kits
1. Factory-Fitted (OEM) CNG Kits
- Installed by the car manufacturer
- Maintains vehicle warranty
- Higher cost but better safety and performance
2. Aftermarket (Retrofit) CNG Kits
- Installed by third-party authorized dealers
- More affordable
- May void the original manufacturer’s warranty
- Requires more frequent maintenance
Should You Convert Your Petrol Car to CNG?
Understand the key benefits and trade-offs before switching to CNG for better fuel economy, reduced emissions, and long-term value.
Advantages of Converting Your Petrol Car to CNG
- Fuel Savings: CNG is up to 50% cheaper than petrol.
- Eco-Friendly: Lower carbon emissions and cleaner combustion.
- Government Support: Reduced taxes and incentives in some cities.
- Extended Engine Life: CNG burns cleaner, reducing wear and tear.
Disadvantages of Converting Your Petrol Car to CNG
- Initial Cost: Installation can cost ₹40,000 – ₹70,000, depending on the kit.
- Limited Fueling Stations: Availability may be sparse in rural areas.
- Reduced Boot Space: CNG cylinder takes up trunk space.
- Performance Drop: Slight reduction in engine power and pickup.
- Warranty Issues: Manufacturer warranty may become void if the kit is retrofitted.
CNG offers fuel savings and eco benefits, but weigh costs, space, and warranty impacts before converting your petrol car.
How Installing CNG Kits Affects Your Car Insurance Premiums
Installing a CNG kit impacts your car insurance in several ways:
1. Premium Increase
- The insurance premium may rise slightly due to the added equipment.
- An additional third-party premium of ₹60/year may be charged.
2. Policy Endorsement
- You should must inform your insurer after installing the CNG kit in a petrol car.
- Submit the RTO approval and updated RC copy.
- Failure to declare the modification can void your insurance claim.
3. Own Damage Cover
- The kit’s value will be added to the insured declared value (IDV).
- This might slightly increase the Own Damage (OD) premium.
Certified CNG Kits Are a Must to Convert a Petrol Car
Converting your petrol vehicle to CNG should only be done using government-approved kits and installed by authorized dealers. This ensures:
- Better safety
- RTO approval
- Insurance compliance
- Optimal performance
MIJO AUTO GAS PVT. LTD. manufactures ISO- and ARAI-certified CNG kits designed specifically for Indian roads and driving conditions. Our kits are trusted across India and exported to over 17 countries globally.
Final Thoughts
Converting a petrol car to CNG is a smart, sustainable, and economical choice for many Indian car owners. Whether you’re looking to save on fuel costs, reduce emissions, or extend your vehicle’s usability, CNG offers a practical solution – if done right.
Always choose certified kits, trusted brands, and follow the legal process. For expert installation, after-sales service, and guidance on the right CNG kit for your vehicle, reach out to MIJO AUTO GAS PVT. LTD. today.
