SFI Diesel & Gasoline Fuel Improvers
SFI fuel improvers are 1 litre bottles of fuel system cleaner for diesel and gasoline engines: D-EX for diesel, G-EX for gasoline and QC-D, a quick cleaner used to pre-condition an engine before its first full treatment. That is the whole line, three bottles, sold as a brand collection so a fleet can reorder the one it has settled on.
D-EX and G-EX are formulated to improve combustion and keep injectors clean; QC-D is the first step for an engine that has been running on untreated fuel for a long time. Bottles ship from Winnipeg in 7 to 10 business days.
Three SFI fuel cleaners: D-EX, G-EX and QC-D
The SFI line is short on purpose. D-EX is the diesel treatment, G-EX is the gasoline treatment and QC-D is the quick cleaner that goes in first. Each comes in a 1 litre bottle and each is a different formulation: diesel trucks get D-EX, gasoline trucks get G-EX.
This collection is built from the SFI vendor and nothing else appears in it. If you are here because you carry fuel rather than treat it, the related pages are RotopaX fuel packs for a few gallons on a rack and Dee Zee transfer tanks for a full in-bed tank.
Shop SFI fuel improvers by product
D-EX diesel fuel cleaner
D-EX is the diesel formula, added to the tank to improve combustion and injector cleanliness in diesel pickups, cube vans and equipment engines. Use it on the schedule printed on the bottle after pre-conditioning with QC-D.
G-EX gasoline fuel cleaner
G-EX does the same job for gasoline engines: fleet vans, half-ton pickups and cars. It is the bottle to keep in a mixed fleet where the gas vehicles outnumber the diesels.
QC-D quick cleaner
QC-D is not a maintenance additive. It is the pre-conditioning step for an engine that has never been treated or has been on untreated fuel for a long stretch, used once before starting D-EX or G-EX.
Common applications
Diesel pickups and vans running high kilometres between services, where injector deposits show up as rough idle and smoke. Mixed fleets that want one diesel bottle and one gasoline bottle on the shelf rather than a cabinet of additives. Seasonal equipment coming back into service after sitting, which is where the QC-D pre-conditioning step earns its place.
Why buy SFI here
- Matched to the engine. Separate diesel (D-EX) and gasoline (G-EX) formulas rather than one bottle labelled for both.
- A defined sequence. QC-D first on an untreated engine, then D-EX or G-EX on schedule, so there is no guesswork about where to start.
- One bottle size. Every SFI product here is a 1 litre bottle, which keeps fleet ordering simple.
- Ships across Canada. Orders leave Winnipeg, Manitoba, in 7 to 10 business days.
Choosing the right SFI product
Diesel engine: D-EX. Gasoline engine: G-EX. Engine that has never had a fuel treatment, or has gone a long time without one: a bottle of QC-D first, then the matching cleaner. Do not put D-EX in a gasoline tank or G-EX in a diesel tank; the formulas are not interchangeable. Follow the dose printed on the bottle for your tank size.
If you are not sure what fits, contact us with your year, make, model and configuration.
Common questions
What is the difference between SFI D-EX and G-EX?
D-EX is the diesel fuel cleaner and G-EX is the gasoline fuel cleaner. Both target combustion and injector cleanliness, but each is formulated for its own fuel and they are not swapped.
What is SFI QC-D used for?
QC-D is a quick cleaner for pre-conditioning an engine before treatment. It is a one-time first step for engines that have been running on untreated fuel, followed by D-EX or G-EX.
Can I use D-EX in a gasoline engine?
No. D-EX is the diesel formula. Use G-EX in gasoline engines.
How much SFI do I add to the tank?
Follow the treat ratio printed on the bottle label for your tank size. Each SFI product is sold in a 1 litre bottle.