Converting a diesel car to run on Compressed Natural Gas (CNG) is technically possible but not commonly done. Here are some key points to consider:

Technical Feasibility

1. Complex Conversion Process: Diesel engines operate on a different principle than petrol engines, using compression ignition rather than spark ignition. This makes the conversion more complex.
2. Dual-Fuel Systems: Some conversions involve creating a dual-fuel system where the engine can run on both diesel and CNG simultaneously. This requires significant modifications and specialized equipment.
3. Limited Availability: The availability of conversion kits and skilled technicians for diesel-to-CNG conversions is limited compared to petrol-to-CNG conversions.

Pros and Cons

Pros:

1. Fuel Cost Savings: CNG is generally cheaper than diesel, which can lead to savings on fuel costs.
2. Environmental Benefits: CNG produces fewer pollutants and greenhouse gases compared to diesel, which can reduce the vehicle's environmental impact.

Cons:

1. High Conversion Cost: The conversion process can be expensive, often more than converting a petrol engine to CNG.
2. Performance Issues: Diesel engines are not optimized for CNG, which can lead to reduced performance and efficiency.
3. Limited Infrastructure: The availability of CNG refueling stations may be limited, depending on your location.
4. Maintenance and Reliability: A dual-fuel system requires regular maintenance and can be more complex to troubleshoot and repair.

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Conclusion

While it is technically possible to convert a diesel car to run on CNG, it is generally not recommended due to the complexity, high cost, and potential performance issues. If you are looking to switch to CNG for cost or environmental reasons, it might be more practical to consider a vehicle that is originally designed to run on petrol and then convert it to CNG, or purchase a vehicle that is designed to run on CNG from the outset.