1 – How do I know if PROZONE® FuelSaver is suitable for my vehicle?

PROZONE® FuelSaver is suitable for all vehicles with internal combustion engines using gasoline (petrol) or diesel fuel. It can also be used with two-stroke engines. PROZONE® FuelSaver can be fitted to vehicles already in use, and to new vehicles.

When fitted to a vehicle using unleaded gasoline with a catalytic converter, PROZONE® FuelSaver provides the additional benefit of prolonging exhaust system and catalytic converter life.

PROZONE® FuelSaver units are available in 5 sizes to suit different engine capacities, as shown in the table below. The final digit in the model number indicates the number of alloy cores within each unit (ie: the FS4 contains four alloy cores).

A special model - the FS5 - has been developed for use with the very large diesel engines found on ships and locomotives.

Vehicle Type
Engine Capacity
Unit/Model Number
motorcycles etc
up to 1,000cc
cars & vans
1,000 to 5,000cc
medium trucks & buses
5,000 to 10,000cc
heavy trucks & buses
10,000 to 35,000cc
ships and locomotives
above 35,000cc

2 – Whereabouts on my vehicle is PROZONE® FuelSaver fitted?

PROZONE® FuelSaver consists of an in-line flow-through chamber, which is fitted to your vehicle's fuel line within the engine compartment. Installation of PROZONE® FuelSaver, as close to your vehicle's carburetor or fuel injection pump as possible (see below), can be carried out by any practical motorist, qualified mechanic, or trained automotive technician, and usually takes less than an hour to complete.

3 – How do I know that PROZONE® FuelSaver is working?

After PROZONE® FuelSaver has been fitted, drivers of gasoline-engine vehicles should quickly be aware of an improvement in engine performance.

Drivers of vehicles with carburetors should drive for a further 2,000 to 3,000 miles (3,600 to 5,400 kilometers) before re-tuning the engine for maximum performance.

Drivers of diesel-engine vehicles should notice a gradual improvement in fuel economy and engine performance in addition to a reduction in smoke emissions and diesel knock over a period of several months until optimum operating conditions are reached.

Once installed, PROZONE® FuelSaver will continue working for more than 150,000 miles (240,000 kilometers). Furthermore, exhaust system and catalytic converter life will be prolonged since less corrosive gases now pass through them.

4 – Have any independent tests been carried out on PROZONE® FuelSaver?

Yes. Independent, comparative before-and-after performance tests of PROZONE® FuelSaver have been carried out over the past eight years by a variety of organizations in more than a dozen different countries. These organizations fall into three categories:

1. academic and training institutes with specialized facilities for testing automobiles and automotive accessories

2. organizations with specialist experience of certain types of engines and vehicles

3. companies and individuals who have tested PROZONE® FuelSaver under the practical conditions relative to their own fields of expertise.

Extracts from many of these tests together with testimonials from satisfied customers are given in the pages of Worldwide Test Results and Testimonials.

5 – I've just switched to unleaded gasoline. Can PROZONE® FuelSaver help?

Many motorists are being forced to switch to unleaded gasoline (ULG) as governments around the world ban the sale of leaded gasoline. Drivers, particularly of older vehicles, have expressed concern that ULG may have a detrimental effect on their vehicle's engine.

Although most modern cars can use ULG, many engines need adjustment to prevent pinking or pre-ignition, and to ensure smooth running.

Motorists switching to ULG are worried that adjusting their car engines to use this environmentally friendly fuel may actually result in less engine power and higher fuel consumption, especially under acceleration conditions.

PROZONE® FuelSaver enhances the combustibility of the fuel and improves power output and fuel economy. The result is equivalent to an increase in the octane number of the fuel, and enables engines already running on ULG to use the fuel without adverse effects.

Engines previously adjusted to use ULG can now be re-tuned back to manufacturers' specifications for leaded fuel performance while using unleaded gasoline.