Greentech D51 Heavy-Duty Diesel Fuel Saver Set with Air Refiner — Fleet Trucks & Coaches (up to 500 L)
- 5–25% less fuel in documented results*
- About 10 years, no maintenance
- Patented in multiple countries
$799.00
One-time price · about $6.66 a month over its 10-year life- The flagship set: a heavy-duty enhancer in the tank plus the Air Refiner on the intake.
- 25% less diesel per km: on a 2016 Mercedes heavy truck in Qatar (Bin Sraiya, D51).
- Fitted in minutes: no wiring, no engine changes, no downtime.
- About 10 years: no maintenance, nothing to replace.
- Free shipping over US$150FedEx from Taiwan
- 12-month product warrantycovers the unit itself
- Genuine, serial-numberedverify it online
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Buying for a fleet? Get a volume quote →
*Documented fleet and test results. Each vehicle is measured against its own original fuel use, so the same fuel saved shows as a different percentage on different vehicles. Results vary with engine condition, load and route.
Made for fleet trucks, coaches and excavators
Fleet truckstanks up to 500 L
Coaches & city buseslong daily hours
Mixers & tippersstop-start heavy work
Excavatorsmeasured per engine hourOne D51 per tank of up to 500 litres; trucks with two or three tanks take one enhancer per tank.
Measured by the people who run them
Operators measured their own vehicles and machines before and after fitting. Tap a card for the original document.
🇶🇦Qatar · Bin Sraiya Readymix ConcreteD51−25%diesel per km on the highway, a 2016 Mercedes heavy truck: 2.6 → 3.5 km per litreSigned letter →
🇮🇳India · PS Blue Metals & Mumbai CarriersD51+7.2%km per litre on four heavy trucks over 219,793 km, from the fleets’ own fuel logsCase study →
🇻🇳Vietnam · Logistics PortsercoD51−6.9%diesel on a GPS-tracked city truck: 44.2 → 41.1 litres per 100 kmCase study →
🇮🇳India · Ramalingam ConstructionD51−4.0%diesel per engine hour on a ZAXIS 220LC excavator: 13.13 → 12.60 litresCase study →30 named fleets, plants and public agenciesin 8 countries, each with the original documentSee every case →“The drivers noticed that the trucks which installed Greentech devices performed better in overall engine performance, with less exhaust emissions.”
Each vehicle is measured against its own original fuel use, so the same fuel saved shows as a different percentage on different vehicles. Results vary with engine condition, load and route. All test reports →
Fitted in five minutes, working in thirty
It depends on the application
The enhancer must be in direct contact with the fuel, so it always goes inside the fuel tank.
Take the fuel cap off. Can you see the fuel?
✓Yes: drop it in
Motorcycles and scooters, generators and stationary machines, some boats and other machinery: the fuel is right there, so it is simple to drop the enhancer in.
!No: many cars
The filler often has an anti-siphon valve. The tank is reached through the fuel-pump or fuel-sender service opening instead: a job for a workshop, with the fuel drained first.
- 1Fuel-pump / fuel-sender service opening (usually under the rear seat)
- 2Where the filler pipe joins the tank, underneath
- ✕Filler neck and its anti-siphon valve
Never force it down a car's filler.It can jam in the filler pipe, and the pump nozzle will then keep cutting off every time you refuel.
Not sure? Have a qualified mechanic or an authorized Greentech installer do it. Labour costs vary, so ask for a price first.
Installation guide (PDF):English · 中文
⚠Fuel is hazardous and flammable. Do not smoke near the fuel tank.
- Open the fuel cap
- Drop the enhancer in through the filler neck
- Close the cap and drive as usual: it starts working within about 30 minutes
Greentech is a patented, passive fuel enhancer. Proprietary Greentech Fuel Enhancing Technology helps the fuel atomize finer and burn more completely: more of every litre turns into work, with lower CO and HC emissions and fewer engine carbon deposits.
How the technology works →Plus the Air Refiner, in four steps
Installation video: dropping the enhancer into the tank.
What could it save you?
Slide between 5% and 25%, the documented range.
Most documented results: 5–25% less fuel. Each vehicle is measured against its own original fuel use — the more efficient the vehicle, the bigger the denominator and the smaller the % looks, but the litres still add up. Results vary with engine condition, load and route.
Pick the size for your tank
D-Ballup to 20 LEnhancer
D10up to 100 LEnhancer
D11up to 100 LEnhancer + Air Refiner
D202 × 100 L or 200 LEnhancer
D212 × 100 L or 200 LEnhancer + Air Refiner
D50up to 500 LEnhancer
D51up to 500 LEnhancer + Air RefinerThis modelChoose by fuel and tank size, one enhancer per tank. Models ending in 1 add the Air Refiner on the air intake. Product selector →
What you get
- D51 heavy-duty fuel enhancer (500 L) × 1
- Air Refiner × 1, with cable ties
- Serial-numbered security label
- Gift box
- Fuel
- Diesel
- Tank
- Up to 500 litres per enhancer
- In the box
- Heavy-duty fuel enhancer (500 L) × 1 and Air Refiner × 1, gift box
- Fitting
- Enhancer sits in the fuel tank; Air Refiner in the air filter housing
- Maintenance
- None
- Service life
- About 10 years
- Construction
- Aluminum alloy casing with patented internal components
- Warranty
- 12-month product warranty, activated by registering the serial number
- Shipping
- FedEx from Taiwan · free over US$150
Questions before you buy
How is it fitted on a big tank?
Drop it in at the next fill-up, one enhancer per tank of up to 500 litres: a truck with two or three tanks takes one in each. If a filler is narrow or the tank has baffles, place it at the next tank service.
What does the Air Refiner do?
It treats the air side while the enhancer treats the fuel side. It sits inside the air filter housing, on the intake side before the filter, and any workshop can fit it in a few minutes with the supplied cable ties.
How much will it save?
Documented fleet and test results run from 5% to 25% less fuel. Each vehicle is measured against its own original fuel use: that figure is the denominator, so the same fuel saved shows as a different percentage from one vehicle to the next. Results vary with engine condition, load and route; on the road, the gain is largest at steady cruising speed. Tip: write down your litres and kilometres (or engine hours) for the next couple of tanks before you fit it, and you will see your own number. Free fuel worksheet (Excel) · Online fleet fuel log
Is anything changed on the engine?
No. Nothing is cut, wired or reprogrammed and nothing is added to the fuel. The enhancer simply sits in the tank and keeps working for about ten years.
What does the warranty cover?
Register the serial number and your unit carries a 12-month product warranty. It covers the unit itself: if something goes wrong with it after installation, we replace it with a new one. Verify & register a product
Shipping, payment and returns
Orders leave Taiwan by FedEx within 1–3 working days, and delivery usually takes 3–7 days. Shipping is free on orders over US$150; below that it is US$29.99. Pay with PayPal, Apple Pay or Google Pay. If a unit arrives damaged or defective, we send you a new one. Payment & return policy
How do I know it is genuine?
Every unit carries a serial number (M plus ten digits) and a security label. Check it online before or after you buy, no account needed. Buy from Greentech or a listed distributor. Check a serial number · Find a distributor
Buying for a fleet?
Tell us your vehicles and tank sizes: we match a model to every tank and quote volume pricing. In some countries a local Greentech distributor serves you directly. Get a fleet quote · Find a distributor
Put the flagship to work
The D51 complete set: about ten years, no maintenance.
Ships from Taiwan by FedEx · free over US$150 · 12-month product warranty
Greentech D51$799.00