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REDEX
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Redex: understand the range before choosing
The Redex range here contains separate petrol and diesel fuel-system cleaners in promotional ‘100% extra’ packs. The petrol title explicitly says 250 ml plus 100% extra free, meaning 500 ml total. The diesel title omits a volume, but the matching dimensions/weight and official Redex 500 ml format support checking the physical pack rather than assuming. Official system-cleaner dosing is 2.5 ml per litre of fuel: 125 ml per typical 50-litre tank.
AutoMotoPart currently lists 2 Redex items. The largest Redex groups are 2 fuel-specific system-cleaner entries. Redex totals can change, so a category count is orientation rather than proof that a particular reference suits a vehicle, workplace or job. The exact Redex listing, its current technical information and the item in front of you must agree.
What the Redex page actually covers
| Product group in this range | Current entries | Selection focus |
|---|---|---|
| Petrol and diesel system cleaners | 2 | Separate petrol and diesel formulas: verify the physical 500ml promotional pack, then dose the matching fuel at 2.5ml per litre—125ml for 50 litres. |
The catalogue has one petrol and one diesel cleaner, not a universal additive. ‘100% extra’ describes promotional quantity. At official dosing a 500 ml pack supplies four shots and treats 200 litres; keep a record so residual treated fuel is not dosed repeatedly.
Build a reliable shortlist
Read the fuel cap and handbook, identify the exact Redex formula and confirm the volume on the pack. Calculate from litres of fuel being treated, not nominal tank capacity unless filling from empty. Inspect the bottle seal and use its graduated dosing marks.
| Check | Why it matters | Useful evidence |
|---|---|---|
| Fuel | Petrol and diesel cleaners are formulated separately | Fuel cap, handbook and front label |
| Pack | 100% extra describes quantity, not concentration | Stated millilitres and number of 125ml shots |
| Dose | Official rate is 2.5ml per litre | Actual untreated fuel volume and side graduations |
| Vehicle policy | Supplementary treatments may be restricted | Current vehicle handbook/service guidance |
| Fault state | Cleaner cannot repair hardware or control-system faults | Codes, pressure/flow, ignition and emissions diagnosis |
| Outcome | Economy/emissions vary with condition and duty | Comparable full-tank records or calibrated testing |
If fuel type, pack volume or reservoir cannot be positively identified, stop. If the wrong formula/reservoir has been used, do not start the engine; obtain vehicle-maker and professional recovery advice rather than attempting dilution by guesswork.
Calculate one shot from litres, not slogans
Redex defines a standard system-cleaner shot as 125 ml for a typical 50-litre tank, equivalent to 2.5 ml per litre. Examples are 10 litres/25 ml, 20/50, 25/62.5, 40/100, 50/125, 60/150 and 80/200. A 250 ml standard pack contains two shots; a confirmed 500 ml pack contains four. The promotional wording does not double the dose.
Account for untreated fuel only. If residual fuel already contains the correct dose, calculate the new amount added rather than treating total tank capacity again. Redex says its products have been tested at higher concentrations, but also says not to exceed four times the recommended amount; this is not a reason to overdose. Follow the label rate.
Keep petrol and diesel formulations separate
The petrol cleaner is for petrol fuel systems, including petrol hybrids according to Redex. A hybrid's electric drivetrain does not change the fuel placed in its combustion-engine tank. The diesel cleaner is only for diesel. Neither product belongs in AdBlue, and neither title authorises use with LPG, CNG, aviation fuel, kerosene, two-stroke oil mix or specialist racing fuel.
Verify the filler before opening. On a capless system, locate the maker-supplied fuelling funnel and follow its handbook method; pushing an additive nozzle against the anti-misfuel flap can spill product or damage the neck. Never transfer cleaner into an unlabelled drinks container. Keep a dedicated fuel-compatible measure if the bottle marks cannot give the required partial shot accurately.
Separate claimed benefits from fault repair
Redex describes detergent action that cleans or keeps deposits from injectors and publishes benefits for consumption, emissions and performance. These outcomes depend on deposit condition, fuel, engine calibration, route, temperature and maintenance. ‘Restores’ does not mean an additive rebuilds worn injector needles, a weak pump, leaking seals or low compression. This page does not promise MPG improvement or a test result.
If evaluating fuel economy, record several comparable brim-to-brim fills, distance, load, route, tyre pressure and weather. Dashboard averages can reset or respond to a single journey. For emissions, use calibrated test equipment at defined engine temperature. A cleaner may be part of routine maintenance; it is not a substitute for plugs, filters, oil service, diagnostics or manufacturer repairs.
DPF, EGR, catalyst and warning-light boundaries
Diesel System Cleaner is not the same product as a dedicated DPF cleaner. A DPF can contain combustible soot, non-combustible ash, melted substrate or cracks; pressure sensors, temperature sensors and regeneration controls can also fail. Petrol vehicles can have catalyst, oxygen-sensor, ignition or fuelling faults. Fuel treatment cannot identify these causes.
Do not clear codes, force regeneration or drive against a stop warning merely after adding cleaner. Diagnose misfire, fuel leakage, rising oil level, abnormal smoke, limp mode and aftertreatment warnings under the vehicle procedure. A catalyst can be damaged by continued misfire; a heavily loaded DPF may require controlled workshop service. Additive claims never overrule safety warnings.
Safe dispensing, storage and spill control
Read the current Redex safety sheet for the exact petrol or diesel product. Switch off the engine, exclude smoking/flames/hot work and dispense in a ventilated area. Wear specified gloves and eye protection. Wipe the bottle neck before closing and wash exposed skin as directed. If product reaches paint, ground or drains, follow the safety-sheet spill response rather than assuming fuel-additive status makes it harmless.
Store the promotional bottle sealed, upright and labelled, away from heat and children's access. Do not leave it rolling in a passenger footwell or pour it into a food container. Track partial use by date and millilitres. Dispose of empty packaging and contaminated absorbent under local rules; never burn or reuse the bottle.
From identification to a checked result
| Stage | Good practice for this range | Mistake to avoid |
|---|---|---|
| Confirm | Identify petrol or diesel, maker permission and correct filler | Treating the formulas as interchangeable |
| Calculate | Use 2.5ml per litre of untreated fuel | Emptying a 500ml promo pack into one tank |
| Prepare | Isolate ignition and use label marks/approved funnel | Forcing a capless neck or using a drinks bottle |
| Add/record | Dose fuel tank and log fuel, millilitres, date and mileage | Adding to AdBlue or redosing residual treated fuel |
| Evaluate | Maintain normally and compare controlled records | Guaranteeing economy, emissions, repair or test passage |
Record exact formula, pack reference/volume, fuel type, untreated litres and millilitres added. Keep fault codes and before/after data separate from marketing claims so a developing mechanical problem is not masked by repeated treatment.
Reading real Redex references
The Redex names below are examples from the current range and show why the complete description matters. They are not universal Redex recommendations and should not be treated as a fitment list. Within Redex, a shared family word can conceal a different dimension, connector, material, pack format, operating condition or installation side.
| Example listing | What to verify beyond the name |
|---|---|
| Redex Diesel System Cleaner 100% Extra fill | Petrol System Cleaner promotional pack: title confirms 250ml plus 100% extra (500ml total); four 125ml shots for 200L petrol at 2.5ml/L |
| Redex Petrol Injector Cleaner - 250ml with 100% Extra Free | Diesel System Cleaner promotional extra-fill pack: verify physical volume/shot marks; use only in diesel at the same 2.5ml/L official rate |
The matching dimensions and weight suggest both live promo entries are 500 ml, but only the petrol title explicitly confirms it. Read the diesel bottle; do not infer a dose from catalogue weight or promotional wording.
Common errors around Redex products
- Using petrol cleaner in diesel or diesel cleaner in petrol.
- Treating 100% extra as double-strength or a whole-tank dose.
- Assuming the diesel volume without checking its physical label.
- Pouring cleaner into AdBlue, oil, coolant or an unidentified filler.
- Repeatedly dosing residual fuel already treated.
- Forcing the bottle through a capless filler instead of using the vehicle funnel.
- Promising fuel savings, lower emissions or an inspection pass.
- Using cleaner instead of diagnosing injectors, ignition, EGR, catalyst or DPF faults.
Redex questions and answers
Q: Which Redex products are listed?
A: Separate petrol and diesel system cleaners in promotional extra-fill packs.
Q: What does 100% extra mean?
A: It describes extra pack quantity, not a higher concentration or dose.
Q: How much is in the petrol pack?
A: The title states 250ml plus 100% extra, so 500ml total.
Q: How much is in the diesel pack?
A: The title omits volume; verify the bottle label and dosing marks before use.
Q: What is the official dose?
A: 2.5ml cleaner per litre of matching fuel, or 125ml for 50 litres.
Q: How many doses are in 500ml?
A: Four 125ml shots, treating 200 litres in total.
Q: Can petrol cleaner go in diesel?
A: No. Redex says each formula is specific to its named fuel.
Q: Can it be added to a hybrid?
A: Redex states petrol cleaner suits petrol hybrids; confirm the vehicle policy and petrol filler.
Q: Can either product go in AdBlue?
A: No. Both belong only in the correct fuel tank.
Q: Will it guarantee better MPG or emissions?
A: No. Those outcomes vary and require controlled measurement.
Q: Will diesel cleaner unblock a DPF?
A: Do not assume so; diagnose soot/ash loading, sensors and regeneration faults.
Q: What if the wrong tank was used?
A: Do not start the engine; seek vehicle-maker and professional recovery advice immediately.
