#1 in Fuel Injector Cleaner
1 day running
Priced as of May 14, 2026
4.8(8,992 ratings)Subscribe & Save: $15.17 (5% off)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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Prices may varyCarCareTruth's Analysis
Last reviewed May 15, 2026
TL;DR PEA chemistry — polyetheramine, confirmed directly in the US SDS, which is rare for this category. Nearly 9,000 Amazon ratings at 4.8/5 with borescope-documented GDI intake valve results in community threads. No independent SAE paper specific to this product.
What it is and how it performs
SI-1 uses polyetheramine (PEA) — the detergent class most studied for injector deposit dissolution and intake valve carbon removal — confirmed directly in the US SDS §3. Protocol: full bottle into a near-empty tank for initial cleaning, then half-bottle every 1,500 miles for maintenance. Community evidence is specific: a long-running BITOG thread includes borescope images of GDI intake valve deposits before and after treatment. No product-specific SAE paper or dyno test found.
Who should buy this — and who should skip it
Best for owners running non-Top Tier fuel who want a concentrated PEA treatment — one-tank flush for suspected deposits or a 1,500-mile maintenance cadence. GDI owners with intake valve carbon are a strong fit. Skip it if you always run Top Tier certified gasoline — that OEM detergent package already covers prevention. Skip it for severe rough idle or stalling — one bottle is not a substitute for professional ultrasonic cleaning.
Safety and environmental impact
SDS §2: WARNING with H315 (skin irritation), H317 (skin sensitizer), H319 (eye irritation), and H412 (aquatic toxicity, chronic). No respiratory H-codes at mixture level — the low-volatility carrier means inhalation exposure during the pour is negligible. The Amazon listing carries a Prop 65 warning; SDS §15 names naphthalene as the specific Prop 65 carcinogen. The product combusts in the engine — exhaust byproducts are the environmental endpoint.
From the manufacturer
Marketing copy from Red Line, via Amazon. Not editorial.
- •DESIGNED TO EXCEED EXPECTATIONS: Red Line complete SI-1 fuel system cleaner is a premium fuel additive, providing an effective fuel treatment solution to clean and prevent corrosion in fuel systems.
- •PERFORM AND PROTECT: Fuel additive cleans injectors, carburetors, valve and combustion chamber deposits with a powerful, concentrated blend of high-temp and low-temp detergents
- •EFFICIENT FUEL BURN: A gas treatment that enhances gasoline stability, while reducing the build up of gum and varnish formation, leading to smoother operation and increased power output.
- •EASY TO USE: Use one bottle of Redline Fuel System Cleaner per tank for most effective treatment, additive cleans nearly 100% efficiency in one treatment
- •ENAHNCED ENGINE EFFCIENCY: Experience improved fuel economy and engine performance with Red Line 60103 SI-1 Complete Fuel System Cleaner, as it effectively removes deposits, for enhanced exhaust system function
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Manufacturer videos
Manufacturer images
Manufacturer specifications
- Brand
- Red Line
- Item Form
- Oil
- Item Volume
- 443 Milliliters
- Unit Count
- 15.0 Fluid Ounces
- Number of Items
- 1
- Contains Liquid Contents?
- Yes
- Container Type
- Bottle
- Brand Name
- Red Line
- Global Trade Identification Number
- 00083522601030, 07262318274969
- Manufacturer
- Red Line
- UPC
- 083522601030
- Model Number
- (60103)
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Phenomenal Cleaner With High PEA %
Does the job and seemed to help my engine run smoother. I also like that it has a high PEA content, which is one of the main ingredients I look for in a quality fuel system cleaner. It’s easy to use and feels more legitimate than a lot of cheaper fuel additives.The only downside is that it is a little pricey, but overall I’d still recommend it if you want a solid fuel system cleaner.