Save Fuel. Protect Your Engine.
- Up to 13.9% fuel reduction
- ISO 9001:2015 certified
- Payback in 3–5 months
About Okelcor
B2B and B2C tyre wholesale company headquartered in Munich, Germany. Supplying premium tyres to distributors and fleets across Europe, Africa and the Middle East.
Our StoryCertifications
ISO 9001:2015
Certified by qm-solutions GmbH, Germany
Valid until January 2026
From Okelcor, for fleets
FET fuel efficiency technology
A catalytic device fitted to the fuel line that improves combustion, cuts consumption and lowers CO₂ output. Compatible with diesel and petrol engines, and matched to your fleet through the engine lookup below.
- Verified saving
- 13.9%
- Fits
- Diesel & petrol
- Payback
- 3 to 5 months
Which FET model fits your engine
Four models cover everything from a 1.0 litre city car to heavy commercial machinery. Search the database by manufacturer or model, or take the full listing as a PDF.
Engine Lookup
Is your engine compatible?
Search by manufacturer or engine code to find your recommended FET model.
No results found.
Try a different search or download the PDF for the full list.
What the tests measured
Three independent tests, one of them run by a German public authority on its own vehicle. The reports are downloadable, not summarised away.
| Test | Vehicle & operator | Measured result | Report |
|---|---|---|---|
Field test Jan to Oct 2025, daily operation | VW T5 van, Landesbaubehörde Stadthagen German regional state authority | 11.52 → 9.92 l/100km 13.9% verified saving | |
Field test Winter operation, extended period | Mercedes-Benz Unimog | About 10.9% saved Consistent across the test period | On request |
Laboratory Constant speed runs | Against an untreated baseline vehicle | Up to 15% improvement | On request |
For the T5 class of vehicle that works out to roughly €900 to €1,300 saved per year, which pays for the device in 3 to 5 months. Signed and certified by CTI GmbH, Lippstadt.
How it works
1
Fitted to the fuel line
Installed directly into the fuel supply line in under an hour. No engine modification and no downtime.
2
Activates with engine heat
At operating temperature the catalytic process starts treating the fuel passing through, restructuring its molecules.
3
Burns more completely
Better structured fuel extracts more energy per litre, which is where the savings and the lower emissions come from.
Retrofits to any diesel or petrol engine without mechanical modification
Savings are documentable with before and after fuel logs, ready for fleet reporting
More complete combustion means fewer particulates and less CO2 per kilometre
Proven across cars, trucks, vans, agricultural machinery, marine and construction plant
The more vehicles in the fleet, the stronger the return; savings compound per unit
Results come from measured field and laboratory data, not from marketing claims
Work out the payback for your own fleet
Enter your vehicle details and fuel spend; the calculator shows when the device has paid for itself.
Annual Fuel Cost
€1.733
Without FET
Annual Savings
€173
Per year with FET
Payback Period
1.7 yr
Time to break even
Estimates based on field and lab test data. Actual savings vary by vehicle condition, driving pattern, and fuel quality.
ISO 9001:2015 quality management
Issued to Collaborate Together And Invest GmbH (CTI) by qm‑solutions GmbH, Germany. Stated validity to 30 January 2026.
Not sure it fits your fleet?
Tell us what you run and we come back with a model recommendation and a written quote. No commitment attached.