Can a National 5 Vehicle Be Upgraded to National 6?
3 Answers
Generally, vehicles meeting the National 5 emission standards cannot be upgraded to National 6 emission standards. Specific Regulations: The National 6 emission standard is an upgraded version of the current National 5 emission standard. It imposes stricter limits on the emissions of CO (carbon monoxide), THC (total hydrocarbons), NMHC (non-methane hydrocarbons), NOX (nitrogen oxides), and PM (particulate matter mass) compared to the National 5 standard. Additionally, it introduces new regulations on PN (particulate matter number) emissions. Emission Regulations: According to estimates, under the National 6 emission standard, light-duty gasoline vehicles will see a reduction of approximately 50% in carbon monoxide, hydrocarbons, non-methane total hydrocarbons, and nitrogen oxide emissions compared to the National 5 phase, with particulate matter emissions reduced by about 40%. For heavy-duty diesel vehicles, nitrogen oxides and particulate matter emissions will be reduced by more than 60% compared to the National 5 phase.
To be honest, as someone who frequently modifies cars, I think upgrading from China 5 to China 6 standards is technically complex but theoretically feasible. This usually involves replacing the catalytic converter, updating the engine control unit software, and even modifying the exhaust system to meet stricter emission requirements. I once tried helping modify an older car in a friend's garage, but found it too difficult—matching parts wasn't easy, and emission tests could still fail after adjustments. The key issue is that the original factory design locks in the emission standards. People with strong DIY skills can attempt it, but don't expect full compliance; after spending thousands on parts, performance might even degrade, making it better to keep the China 5 car for daily use. I suggest checking local policies first, as some areas may prohibit self-upgrades to avoid wasting money. In short, it's fine for fun, but has little practical value.
I've been driving my family's China V emission standard car and have been worried about upgrading it. I went to ask several repair shops, and the mechanics said it's very difficult—high cost, high risk, probably requiring a complete replacement of the emission system, costing over ten thousand yuan and possibly damaging the engine. As an ordinary car owner, I'm more concerned about saving money and hassle: the China VI standard is certified for the whole vehicle, and modifications would make it illegal to drive, causing trouble during annual inspections. It's better to save some money on car maintenance and directly choose a China VI model when it's time to buy a new car—more environmentally friendly and reliable. Don't mess around unnecessarily, just drive with peace of mind. After all, China V cars can still be driven for several more years.
