Additives
Cleaning additives and fuel additives by QUICKSILVER and Pro-Tec. Free delivery on orders over 100 BGN.
Quicksilver Quickstor – Fuel Stabilizer Gasoline Additive (355 ml)
Quicksilver Quickstor is a high-performance fuel stabilizer designed to keep gasoline fresh during long-term storage of boats and engines. It prevents regular and ethanol-blended fuel from breaking down or oxidizing for up to 12 months, protecting the fuel system from corrosion, gum, and varnish deposits. Perfect for winterizing outboards, personal watercraft, generators, and other gasoline equipment.
- Prevents degradation of both regular and ethanol-blend gasoline (E5, E10) during storage.
- Stabilizes fuel for up to 1 year – ensures easy starts and smooth running even after long lay-ups.
- Guards against rust and corrosion in the tank, fuel lines, carburetors, and injectors.
- Stops gum and varnish formation – keeps fuel systems clean and free of clogs.
In stock
Quicksilver Quickleen – Fuel System Cleaner Additive (355 ml)
Quicksilver Quickleen is a powerful gasoline additive that removes carbon, varnish, and other deposits from your engine’s fuel system. It keeps carburetors, injectors, intake valves, and combustion chambers clean, resulting in smoother engine operation, better fuel economy, and extended spark plug life. Recommended for periodic use in all outboard motors, personal watercraft, and other gasoline machines to maintain peak performance.
- Quickly breaks down and cleans carbon deposits from carburetors, injectors, valves, and pistons.
- Restores power and acceleration – eliminates causes of rough idle, misfires, and hesitation.
- Prevents engine knock and overheating by removing carbon hot-spots that can cause pre-ignition.
- Prolongs spark plug and engine life – a clean fuel system reduces stress on components and improves combustion efficiency.
In stock
Quicksilver Quickare – Multi-Purpose Gasoline Fuel Treatment (355 ml)
Quicksilver Quickare is an every-fill gasoline additive that improves fuel quality and protects your engine at each fill-up. It’s specially formulated to tackle modern fuel challenges, particularly ethanol (E10) issues. Quickare controls moisture, prevents corrosion and deposit formation, and keeps the fuel system clean. Regular use results in smoother engine operation and more reliable performance throughout the season.
- Maximizes performance with all grades of gasoline – maintains fuel’s octane and stability.
- Prevents corrosion, gum, and varnish – counteracts harmful effects of ethanol (E5/E10) such as moisture absorption and deposit formation.
- Controls fuel phase separation – helps keep water from separating out, protecting the engine from ingesting water droplets.
- Safe for continuous use – suitable for all 2-stroke and 4-stroke gasoline engines, keeping them in peak condition.
In stock
Quicksilver Power Tune Internal Engine Cleaner Spray
Quicksilver Power Tune is an aerosol internal engine cleaner that restores engine power by removing carbon, gum, and varnish deposits from gasoline engines. It’s easy to apply and highly effective, suitable for both 2-stroke and 4-stroke engines across a variety of gasoline-powered equipment.
- Removes accumulated black carbon, gummy residue, and varnish deposits from the combustion chamber, pistons, and intake valves.
- Restores smooth engine operation and improves throttle response after use, eliminating power loss caused by build-ups.
- Compatible with all carbureted and fuel-injected gasoline engines – outboards and inboards, personal watercraft, cars, motorcycles, ATVs, and more.
- Safe for engines with catalytic converters – will not harm oxygen sensors or catalytic elements during use.
- Quick and simple to apply: comes in a spray can with a thin nozzle tube for precise spraying directly into the intake or carburetor throat.
In stock
Quicksilver Storage Seal Engine Fogging Oil Spray
Quicksilver Storage Seal is a heavy-duty fogging oil spray designed to protect engine internals during seasonal or long-term storage. When sprayed, it leaves a sticky oil film on cylinders and components, shielding them from rust, corrosion, and dry starts when it’s time to fire up the engine again after storage.
- Thick fogging oil in an aerosol can with an extension tube for easy spraying into the intake or directly into cylinders.
- Forms a durable protective coating on metal surfaces that repels moisture and prevents rust from forming on cylinders, pistons, valves, and rings.
- Prevents the dreaded “dry start” in spring – keeps cylinder walls lubricated to avoid wear during the first crank of the engine after a long lay-up.
- Suitable for all 2-stroke and 4-stroke gasoline engines: outboard motors, inboard/sterndrive engines, motorcycles, ATVs, cars, lawn mowers, snowblowers, etc.
- A must-have step for winterization – use Storage Seal as the final stage of any boat or engine lay-up procedure to ensure full internal protection during storage.
In stock
Quicksilver Corrosion Guard Rust Inhibitor Spray
Quicksilver Corrosion Guard is an easy-to-use anti-corrosion spray that provides long-lasting rust protection for all exposed metal surfaces on your boat and engine. When applied, it forms a clear, water-resistant coating that shields metals from saltwater, moisture, and the elements.
- Creates a thin, wax-like barrier that repels water and prevents moisture from reaching the metal.
- Ideal for protecting outdrives/lower units, trim and tilt mechanisms, hydraulic pumps, bolts, and other exposed engine parts.
- Stops existing rust from spreading on scratched or damaged painted surfaces – can be used to “seal” chipped paint to halt corrosion creep.
- Safe to use on painted and unpainted metals (do not spray on antifouling bottom paint).
- Effective year-round – apply after each saltwater outing or before long-term outdoor storage of your boat to keep your equipment corrosion-free.
In stock

