Best Car Engine Degreaser (2026)
Four engine degreasers for greasy engine bays, compared by size, formula, dwell time and warranty.
On this page
Top picks at a glance
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- 1
Best OverallGUNK Engine Degreaser9.6/10View on Amazon - 2
Best Value3D Orange 1 Gallon9.6/10View on Amazon - 3
Best Small Bottle3D Orange 16 Oz9.5/10View on Amazon - 4
Foaming SprayWD-40 Engine Degreaser9.5/10View on Amazon
Open the hood after a long winter and the engine bay wears a coat of baked-on oil and road grime. A degreaser that can cut that film without a scrub brush turns a dreaded job into a quick spray, wait and rinse. This best car engine degreaser roundup compares each degreaser on what its listing states, so you can match the bottle to the job.
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Quick picks
- Best Overall GUNK Engine Degreaser: Engine-specific spray, 15 oz cans in a pack of 12, 10 to 15 minute dwell and a 90 day warranty. Check price on Amazon
- Best Value 3D Orange 1 Gallon: 128 fl oz of the same citrus formula, water-based, non-corrosive and body shop safe. Check price on Amazon
- Best Small Bottle 3D Orange 16 Oz: The same citrus formula in a 16 fl oz bottle for occasional engine bay jobs. Check price on Amazon
- Foaming Spray WD-40 Engine Degreaser: A foaming 18 oz spray; only the title was listed, so size is all the listing states. Check price on Amazon
Picks for the garage
GUNK Engine Degreaser – Original Degreaser Cleaner
An engine-specific degreaser spray in 15 oz cans, sold as a pack of 12, with a 10 to 15 minute dwell and no scrubbing.
Pros
- Engine-specific formula for baked-on oil and grease
- Pack of 12 cans of 15 oz
- No scrubbing: spray on, wait, hose off
- 90 day warranty stated
Cons
- No safety certification is stated
- Case measures 11.0 by 8.3 by 10.0 inches, so it needs shelf space
- Aimed at older, greasy engines, so it may be more than a light job needs
- Spray only; no foaming version in this listing
3D Orange Degreaser 1 Gallon
A gallon of citrus degreaser, 128 fl oz, water-based and non-corrosive, for engine bays and many other surfaces.
Pros
- 128 fl oz in a single jug
- Water-based, non-corrosive and non-caustic
- Body shop safe, around paint and bodywork
- Made in the USA, per the listing
Cons
- No warranty term is stated
- No dwell time is stated
- Weighs 8.0 pounds, so it needs a low shelf
- A multi-surface cleaner, not an engine-only formula
3D Orange Degreaser – Citrus-Based Car Cleaner
The same citrus degreaser in a 16 fl oz bottle, water-based and non-corrosive, for engine bays and touch points.
Pros
- Same citrus formula as the gallon, in a small bottle
- Water-based, non-corrosive and non-caustic
- Body shop safe, around paint and bodywork
- Made in the USA, per the listing
Cons
- No warranty term is stated
- No dwell time is stated
- 16 fl oz, the smallest size here
- A multi-surface cleaner, not an engine-only formula
WD-40 Specialist Machine & Engine Degreaser
An 18 oz industrial-strength foaming spray that shoots up to 5 ft, with a precision straw for tight spots on engines and machinery.
Pros
- Nozzle sprays up to 5 ft for long-distance application
- Included straw creates a precision stream for tight spots
- Low-residue, water-based foaming formula
- Listed for auto and truck engines, machinery and farm equipment
Cons
- No warranty term with a concrete length is stated
- No safety certifications are stated
- Single 18 oz can, not a multi-pack
- The listing gives no dwell time figure
Compared on paper
| Model | Shop Score | Size | Formula | Dwell | Surfaces | Warranty |
|---|---|---|---|---|---|---|
| GUNK Engine Degreaser | 9.6/10 | 15 oz, pack of 12 | Degreaser spray | 10 to 15 minutes | Cars, trucks, mowers, RVs, ATVs, bikes, farm equipment, tractors | 90 days |
| 3D Orange 1 Gallon | 9.6/10 | 128 Fl Oz | Citrus, water-based | Not stated | Vinyl, plastic, cloth, carpet, metal, leather | Not stated |
| 3D Orange 16 Oz | 9.5/10 | 16 Fl Oz | Citrus, water-based | Not stated | Vinyl, plastic, cloth, carpet, metal, leather | Not stated |
| WD-40 Engine Degreaser | 9.5/10 | 18 oz | Foaming spray | Not stated | Not stated | Not stated |
Specifications are manufacturer rated, as published on each listing and collected 1 November 2026. Where a listing contradicts itself, both figures are shown.
How the points were given
Each degreaser is scored out of 10 on performance, build, value, safety and warranty, with the weights published on our How We Pick page. The 3D Orange listings state water-based, non-corrosive and non-caustic formulas, so they score on safety, and GUNK is the only pick with a stated warranty term.
| Product | Shop Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| GUNK Engine Degreaser | 9.6 | 33 | 21 | 21 | 0 | 2 |
| 3D Orange 1 Gallon | 9.6 | 30 | 21 | 22 | 3 | 0 |
| 3D Orange 16 Oz | 9.5 | 29 | 21 | 19 | 3 | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.
What the listings tell you
We read four degreaser listings. GUNK is the only one with a stated warranty term, the 3D Orange listings state a water-based, non-corrosive formula, and one lists only a title, with no bullets or spec table. Both 3D Orange listings share the same citrus formula in different sizes.
Buying guide: the best car engine degreaser
Spray, foam or citrus
GUNK sprays on and hoses off with no scrubbing, and the WD-40 pick is a foaming spray. The 3D Orange pair is a citrus formula built on d’Limonene terpenes, water-based and non-corrosive. Pick the format that matches the job: spray for a full bay, citrus when you want a water-based cleaner.
Size and the case
GUNK sells as a pack of 12 cans of 15 oz, so one order stocks the shelf for a run of engine jobs. The 3D Orange gallon holds 128 fl oz in one jug, while the small bottle holds 16 fl oz for occasional jobs. The WD-40 pick is an 18 oz can, with only the title to go on.
Dwell time
Only GUNK states a dwell time: spray it on, wait 10 to 15 minutes, then rinse it away. Neither 3D Orange listing states a dwell time, and the WD-40 listing states none either. When a listing gives no dwell time, check the label on the bottle before the first job.
Surfaces and paint
The 3D Orange maker lists vinyl, plastic, cloth, carpet, metal and leather as safe surfaces, and says the formula is body shop safe around paint. GUNK lists cars, trucks, power mowers, RVs, ATVs, bikes, farm equipment and tractors as uses, with no paint claim. Match the cleaner to the surface, and keep sprays off paint unless the listing says they are safe there.
Rinse and storage
GUNK rinses with water after the dwell, and 3D Orange rinses clean with no film or residue, per the maker. A pressure washer for the engine bay speeds the rinse, but a garden hose does the job the listings describe. Store the gallon low on the shelf: at 8.0 pounds it is the heaviest bottle with a stated weight here.
Keep electric pressure washers on a GFCI outlet, never point the wand at people or pets, wear eye protection with polishers and chemicals, and read the label before mixing any cleaning products. Read our Safety Disclaimer.
Garage Fit Check
- The GUNK case measures 11.0 by 8.3 by 10.0 inches and holds 12 cans: leave shelf space for the case, not one can.
- The 3D Orange gallon weighs 8.0 pounds: keep it low on the shelf, where a full jug is easy to lift.
- The 16 fl oz bottle weighs 1.0 pounds and fits a small shelf or a detailing tote.
- WD-40 lists only a title, so check the can size on the listing before you plan shelf space.
FAQ: garage tools
What is the best engine degreaser?
For an engine bay caked in oil and grease, GUNK leads here: an engine-specific spray with a 10 to 15 minute dwell, no scrubbing, a pack of 12 cans and a 90 day warranty. If you want the most cleaner for the money, the 3D Orange gallon gives you 128 fl oz of a water-based citrus formula. The right pick depends on whether the job is one greasy engine or a season of detailing.
How to clean an engine without degreaser?
A water-based citrus cleaner can do the job: the 3D Orange listings describe a citrus formula that cuts grease and grime on contact and rinses clean, and the maker lists vinyl, plastic, cloth, carpet, metal and leather as safe surfaces. The maker also says it leaves no film or residue, so a wipe leaves the surface clean.
Is engine degreaser safe on paint?
The 3D Orange listings say the formula is body shop safe and non-corrosive, and safe for use around sensitive areas like bodywork and paint. GUNK makes no paint claim, so keep its spray on the engine itself and rinse with water. When in doubt, check the label on the can.
Is engine degreaser flammable?
None of the four listings states whether its formula is flammable, so this roundup cannot answer that from the listings alone. Check the label on the can before you spray near heat or sparks.
Is engine degreaser safe on rubber?
None of the four listings mentions rubber, so there is no stated answer here. The 3D Orange maker lists vinyl, plastic, cloth, carpet, metal and leather as safe surfaces, and rubber is not among them. Check the label before you spray hoses or seals.
Related: the best engine degreaser foam, the best engine degreaser for diesel, our engine and shop equipment hub and our car detailing hub. Also see our best car detailing kit. Also see our engine degreaser vs brake cleaner. Also see our best detailing brush set for engine bay.
