Redline SI-1 Fuel System Cleaner 15oz

Redline SI-1 Fuel System Cleaner (15oz)

SI-1 Fuel Cleaner from Red Line uses a concentrated blend of high-temp and low-temp detergents. It cleans injectors, carburetors, valves, and combustion chamber deposits in one treatment. It works on all types of fuel injectors, including direct injection (GDI) systems. One bottle per tank gives the most effective treatment and cleans injectors to nearly 100% efficiency. Many enthusiasts and workshops regard it as one of the best fuel system cleaners available.

How SI-1 Fuel Cleaner Works

This cleaner also enhances fuel stability and reduces gum and varnish formation in the fuel system. It contains a synthetic upper cylinder lubricant, which helps protect valves and rings while it cleans. It cleans deposits from intake valves and combustion chambers. As a result, it can reduce your engine’s octane requirement by up to two points. It also cleans pollution control valves as part of the same treatment. A dirty fuel system can cost you power and fuel economy long before a warning light ever appears. Regular treatment can also help restore lost fuel economy and throttle response that gradual injector fouling causes over time.

Compatibility and Use

SI-1 is safe to use with oxygenated fuels, and it’s safe for continual use every time you fill up. Add a full bottle to a nearly empty tank for the strongest clean, then top up with fuel as normal. Red Line also sells the same chemistry in a smaller 4oz dosage as Complete Fuel System Cleaner for powersports applications. Regular use keeps injectors clean instead of letting deposits build up between treatments. It’s worth adding to your routine service schedule alongside oil and filter changes.

This 15oz bottle treats a full tank on most cars, utes, and light trucks. Not sure how often to treat your fuel system, or which Red Line additive suits your vehicle? Get in touch and we’ll help you choose. For the full technical data sheet, see Redline’s official product page.