Do you need to change your oil after using this through a full tank of gas?

No need to change oil. This is a fuel additive that cleans fuel injectors to better mileage. Does work.

Is this ok as y to use with diesel engines?

NO....use the one for diesel (Red Line 85 Plus Diesel Fuel Additive (12 oz.) (Quantity 1)) It is also available on Amazon in several qtys.

does this also help clean the catalytic converter?

Maybe it cleans fuel system and injectors. Help clean the CAT? Sorry, I can't answer that question.

Has anyone tried using this as for an engine flush? What were the results?

No, and why use it as an engine flush? This product was formulated and meant to be used as a fuel system cleaner and it's an effective one, at least in my case. I've been using in the past 4 years on 3 different vehicles. Best results you'll really notice is using it every 15-20k. Using it more frequently is just a waste. Now, going back to engine flush question, I've used BG EPR. I used it on my wife's 2010 CRV with 150k and0

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Red Line 60103 SI-1 Complete Fuel System Cleaner, Cleans and Prevents Corrosion in Fuel Systems, Cleans Injectors, Carburetors, Valve and Combustion Chamber Deposits - 15 Ounce (4 Pack)

Product ID: 9408228

Details

Brand
Red Line
Item Form
Liquid
Material Feature
Unscented
Scent
Unscented
Specific Uses For Product
Fuel System

⚡Boosts fuel efficiency & combustion

⛽Cleans fuel injectors & carburetors

🛡️Prevents corrosion in fuel system

811 Lei

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Description

⛽ Clean fuel, smooth drive, zero compromises.

ONE TANK POWER - Just one bottle per tank delivers nearly 100% cleaning efficiency—no guesswork needed.
FUEL EFFICIENCY BOOSTER - Enhances gasoline stability, reducing gum and varnish buildup for smoother rides.
CORROSION DEFENSE SHIELD - Protects your fuel system from rust and wear, extending engine life.
MAXIMUM INJECTOR CLARITY - High PEA concentration dissolves stubborn deposits for peak engine performance.
TRUSTED BY PROS ENTHUSIASTS - Top-ranked #1 fuel system cleaner with 4.8-star rating from over 10,000 users.

Red Line 60103 SI-1 is a premium 15 oz fuel system cleaner (4-pack) formulated with 30-50% polyether amines (PEA) to effectively clean injectors, carburetors, valves, and combustion chambers while preventing corrosion. It improves fuel combustion efficiency, reduces gum and varnish buildup, and is proven to maintain near-perfect engine performance with just 1 oz per tank. Highly rated and cost-effective, it’s the go-to choice for millennial professionals who demand reliability and peak vehicle performance.

Specifications

ASIN	B00NQB6O0A
Best Sellers Rank	#50 in Automotive ( See Top 100 in Automotive ) #1 in Fuel System Cleaners
Brand Name	Red Line
Customer Reviews	4.8 4.8 out of 5 stars (10,998)
Included Components	Fuel System Cleaner
Item Form	Liquid
Item Type Name	Fuel System Cleaner
Item Volume	425 ml
Item Weight	3.6 pounds
Manufacturer	Red Line
Material Features	Unscented
Model Number	60103
Number of Items	4
Part Number	60103-4-
Scent	Unscented
Size	15 Fl Oz (Pack of 4)
Special Features	Reduces need for octane by up to two points
Specific Uses For Product	Fuel System Cleaner
UPC	737534816455
Unit Count	60 Fluid Ounces

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811 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Romania.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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