Red Line SI-1 Fuel System Cleaner 15oz - 12-Pack - Gasoline, Cleans Injectors & Valves

Red Line SI-1 is a concentrated fuel system cleaner for gasoline engines that cleans injectors, carburetors, intake valves, and combustion chamber deposits in a single treatment. It uses a blend of high-temp and low-temp detergents and works on all fuel injector types, including GDI. This listing is a 12-pack of 15oz bottles.

Beyond cleaning, it adds a synthetic upper-cylinder lubricant, improves fuel stability to reduce gum and varnish, and can lower the octane requirement by up to two points. It is safe for continual use and for oxygenated fuel.

Specifications

Directions

Add one bottle per tank of fuel for the most effective treatment. Safe for continual use.

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy