Emission compliance is a property of the individual model, not of the catalogue as a whole. The 211 models covered here span China Stage VI, China Non-Road Stage III and IV, IMO Tier II, Euro VI and EU Stage IIIA / IIIB / V, plus models supplied without an emission certification requirement. Tell us your market and application and we match a compliant model.
Emission standards across the catalogue
| Standard | Models |
|---|---|
| China Stage VI | 46 |
| China Non-Road Stage IV | 34 |
| China Non-Road Stage III | 29 |
| No emission requirement stated | 24 |
| IMOTierⅡ | 19 |
| IMO Tier Ⅱ | 15 |
| China marine Stage II emission | 11 |
| No Emission Requirement | 9 |
| No emission certification | 7 |
| Euro VI | 6 |
| China marine Stage II | 3 |
| Stage IIIA | 2 |
| Stage V | 1 |
| Europe Stage IIIA | 1 |
| Non-Road Stage III | 1 |
| Stage IIIB | 1 |
| China marine Stage II emissionIMOTierⅡ | 1 |
| Non-road Stage IV | 1 |
How compliance is handled
- The emission standard is stated on every model page – check the model you intend to buy.
- Road, non-road and marine applications use different standards; the same displacement can sit in different tiers depending on the build.
- For marine installations, classification and flag-state requirements are confirmed per project before quotation.
- Where a model carries no emission certification, that is stated on its page rather than omitted.
Documents that accompany a shipment
- Commercial invoice and packing list.
- Bill of lading.
- Certificate of origin where the destination requires it.
- Manufacturer nameplate data and factory test documentation for the engine supplied.
Any further certificate required by your customs authority or registration class should be named at enquiry so it can be confirmed before the order is placed.
What the standard names mean
| Standard | What it applies to |
|---|---|
| China Stage VI | Chinese on-road emission standard for heavy-duty vehicles. |
| China Non-Road Stage III | Chinese emission stage for non-road mobile machinery such as excavators, loaders and agricultural equipment. |
| China Non-Road Stage IV | The tighter Chinese non-road stage that follows Stage III. |
| China marine Stage II | Chinese emission stage applied to marine engines. |
| IMO Tier II | International Maritime Organization nitrogen-oxide tier for marine engines. |
| Euro VI | European on-road heavy-duty emission standard. |
| Stage IIIA / IIIB / V | European non-road emission stages for mobile machinery. |
| No emission requirement | Models supplied into markets or applications where no emission certification is required; stated explicitly on the model page. |
Checking a model before you buy
- Read the emission line on the model page – it is the only reliable statement of what that build carries.
- Match the standard to your registration class or flag state, not to the machine type alone.
- Confirm the configuration: the same displacement can be built to different standards for road, non-road and marine duty.
- Where a model carries no certification requirement, the page says so rather than leaving it blank.
- If your market needs documentation beyond the standard set, name it at enquiry so it can be confirmed before the order is placed.
Why the standard matters commercially
- It decides whether the engine can be registered in your market at all.
- It moves the price inside a power band, because after-treatment hardware is not free.
- It affects maintenance: higher tiers need defined fuel quality and service intervals.
Why genuine Weichai
Siyu Trading specialises exclusively in genuine original Weichai engines and generator sets from Shandong, China. Our range covers construction machinery, excavators, loaders, agricultural equipment, marine heavy industry, transportation, smart logistics, industrial forklifts, large buses, luxury yachts, official patrol boats, heavy-duty trucks and commercial vehicles.
Weichai currently ranks No.1 in global heavy-duty engine sales and holds the world record for brake thermal efficiency at 53.09 %. Weichai engines are exported to more than 180 countries and regions worldwide.
Service is built around the full equipment lifecycle – procurement, operation, maintenance and upgrade – for clients in commercial vehicles, construction machinery, marine power and agricultural equipment.
What to send with your enquiry
Quotations are only as accurate as the specification behind them. Send these six items and you get a firm price and a firm date rather than a range.
- Engine model – the designation you need, or the machine it will be built into if you do not know it.
- Power – required rating in kW, and the duty cycle.
- Quantity – number of units, and whether this is a repeat order.
- Emission standard – the standard your market or registration class requires.
- Destination – country and port, plus the Incoterm you want quoted.
- Configuration – cooling package, power take-off, control system and any ancillaries.
Reach us at +86 138 6894 2030 or info@91engine.com. Both a factory site in Weifang, Shandong and an export office in Yiwu, Zhejiang support the shipment.
Frequently asked questions
- Do you supply Euro VI engines? Yes – Euro VI and China Stage VI models are in the catalogue. Check the emission line on the model page.
- Can you certify for my country? Name the standard and the registration class and we will confirm which models meet it.
- Are marine certificates included? Classification and flag requirements are confirmed per project before quotation.