STA-BIL Marine Tune Up, 16 oz.– Fixes Rough Running Engines – Treats up to 50 Gallons – 16 oz
STA-BIL Marine Tune Up, 16 oz.– Fixes Rough Running Engines – Treats up to 50 Gallons – 16 oz
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STA-BIL Marine Tune Up, 16 oz.– Fixes Rough Running Engines – Treats up to 50 Gallons – 16 oz

|19 ratings
STA-BIL Marine Tune Up, 16 oz.– Fixes Rough Running Engines – Treats up to 50 Gallons – 16 ozSTA BIL Marine Tune Up 16 oz Fixes Rough Running Engines Treats up to 50 Gallons 16 oz2 pack STA BIL Marine Tune Up 16 oz Fixes Rough Running Engines Treats up to 50 Gallons 16 oz4 pack STA BIL Marine Tune Up 16 oz Fixes Rough Running Engines Treats up to 50 Gallons 16 oz3 pack STA BIL Marine Tune Up 16 oz Fixes Rough Running Engines Treats up to 50 Gallons 16 oz
Pack SizeSingle

Key item features

  • Fuel Treatment: STA-BIL Marine Tune Up treats up to 50 gallons of fuel, ensuring optimal performance for your marine engine.
  • Engine Efficiency: Dissolves gum and varnish from the fuel system, helping rough running engines operate smoothly.
  • Rust Protection: Fights rust and corrosion in the fuel system, providing long-lasting protection against moisture and ethanol damage.
  • Water Removal: Eliminates water from the marine fuel system by penetrating deep into the fuel line, suitable for all watersport engines.
  • Usage Instructions: Use 1 oz. per 2.5 gallons of fuel, pour directly into the fuel tank, and run the engine for 15 minutes for best results.
  • Extended Shelf Life: All STA-BIL products are effective for up to 2 years after opening; mark the opening date on the bottle.
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Specs

Brand, STA-BILAutomotive additive type, Fuel System CleanerRec. use, Marine, SnowmobileVolume capacity, 16 ozContainer type, BottleSize, 16 Fl oz

About this item

Product details

STA-BIL Marine Tune Up cleans carburetors and injectors, removes water, lubricates valves and pistons, cleans fuel system. Perfect for all watercraft engines.
  • STA-BIL Marine Tune Up treats up to 50 Gallons
  • Dissolves gum and varnish from fuel system
  • Helps rough running engines
  • Fights rust and corrosion in the fuel system
  • This fuel treatment also maximizes your GPH by helping your engine burn fuel more efficiently.
  • Eliminates Water – Removes water from your marine fuel system by penetrating deep into the fuel line. Compatible with all watersport engines including smaller boats, personal watercraft, jet skis, and more.
  • Prevents Ethanol Damage – A long-lasting protective coating guards your entire fuel system against damaging rust and corrosion caused by moisture and ethanol fuels
  • Directions – Use 1 oz. of STA-BIL Marine Tune-Up per 2.5 gallons of fuel. Pour the product directly into your fuel tank and top off with fresh fuel. Start the engine and leave it running for 15 minutes
  • All STA-BIL branded products are good for use up to 2 years after the bottle was opened. Be sure to mark the date you opened the bottle on the back of your package.
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Specifications

Brand

STA-BIL

Automotive additive type

Fuel System Cleaner

Rec. use

Marine, Snowmobile

Volume capacity

16 oz

Warranty

Warranty information

Satisfaction Guaranteed: If not satisfied, mail sales receipt to us and your purchase will be refunded.

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Warnings

Customer ratings & reviews

4.4 out of 5 stars
stars
19 ratings10 reviews
How item rating is calculated
  1. 5 stars68% (13)
  2. 4 stars21% (4)
  3. 3 stars0% (0)
  4. 2 stars5% (1)
  5. 1 star5% (1)
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Showing 1-3 of 10 reviews

Aug 14, 2026
Reviewer name: Brian
Item details
Multipack quantity: 1
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Good product when used for its intended purpose.

Have used this in the past. Does a good job of breaking down slight varnish and gum from older 2-stroke, pre-mix carbureted outboards. If the carburetor is completely blocked, of course it won't help, but for clearing rough idles it works great as it clears the varnish and gum from the tiny idle circuit passages. Give it a try. Worst case scenario, you're out 12 bucks.

Incentivized Review
Helpful?6M27K0P8D2035038200948
Oct 8, 2026
Reviewer name: Leo
Item details
Multipack quantity: 1
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

well worth the cost.

great stuff, protects your engine and noticeable improvement in idle rpm.

Incentivized Review
Helpful?6M27K0P8D2035038200948
Sep 29, 2026
Reviewer name: Christine
Item details
Multipack quantity: 1
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Helped our boat motor

Great for the boat motor

Incentivized Review
Helpful?6M27K0P8D2035038200948
Current price is $11.9774.8 ¢/fl oz
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