How old can a car be to be converted to CNG?

[LeSophie]

Cars older than four years can be converted to CNG. Advantages of CNG conversion: More economical—natural gas prices are lower, and CNG vehicles have lower per-mile costs compared to gasoline vehicles; more environmentally friendly—natural gas produces significantly less pollution from production to transportation and final usage compared to gasoline. Disadvantages of CNG conversion: Lower range and reduced power—since natural gas is a gaseous fuel, its combustion expansion performance is inferior to gasoline, leading to a noticeable drop in engine power. Additionally, CNG vehicles carry less fuel, resulting in shorter driving ranges compared to gasoline vehicles; occupies space and adds weight—the conversion increases the vehicle's weight, naturally raising energy consumption.