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STA-BIL Storage Fuel Stabilizer 8 Oz. vs STA-BIL Diesel Fuel Stabilizer

These are not interchangeable. The 8 oz STA-BIL Storage is a gasoline stabilizer for cars, mowers, boats and small engines laid up for the season; the Diesel formula is for diesel fuel systems, including biodiesel blends. The gasoline bottle is far cheaper per treatment: $6.78 at Amazon as of November 4, 2026, versus $21.99 at Amazon for the diesel bottle. Buy the one that matches your fuel, not the one with the higher rating.

Today the STA-BIL Storage Fuel Stabilizer 8 Oz. costs $15.21 less at its best price.

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STA-BIL
STA-BIL Storage Fuel Stabilizer 8 Oz.

STA-BIL Storage Fuel Stabilizer 8 Oz.

4.8· 1,255 ratings
$6.78at AmazonObserved at 4:07 PM
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Choose the STA-BIL Storage 8 oz if you are storing a gasoline engine, from a lawn mower to a classic car, and want to treat up to 20 gallons from one $6.78 bottle.

Pros
  • Cheap per treatment at $6.78 for up to 20 gallons
  • Large, established review base of 1,255 ratings
  • Quick-measure pour bottle
  • Works in 2- and 4-cycle gasoline engines
Cons
  • Gasoline only; do not use in diesel
  • 8 oz is a small bottle for large tanks
  • No stated lubricity benefit
STA-BIL
STA-BIL Diesel Fuel Stabilizer

STA-BIL Diesel Fuel Stabilizer

5· 9 ratings
$21.99at AmazonObserved at 4:07 PM
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Choose the STA-BIL Diesel if you run a diesel car, truck or boat, especially on biodiesel blends, and need water removal, lubricity and sludge protection over a long layup.

Pros
  • Formulated for diesel, including biodiesel blends
  • Cleans and lubricates the whole fuel system
  • Handles water, sludge, sediment and oxidation
  • Year-round protection, rated to -40 F
Cons
  • $21.99 versus $6.78 for the gasoline bottle
  • Only 9 ratings behind the 5 of 5 score
  • Not for gasoline engines

What separates them

STA-BIL Storage Fuel Stabilizer 8 Oz.STA-BIL Diesel Fuel Stabilizer
Fuel typeGasoline, 2- and 4-cycle enginesAll diesel engines, ULSD and biodiesel blends
Size8 oz bottle32 oz bottle (listing also shows a gallon option)
Price$6.78 at Amazon as of November 4, 2026$21.99 at Amazon as of November 4, 2026
Dose8 oz treats up to 20 gallonsDose per gallon not stated in the listing; 32 oz goes further per bottle
Water handlingRemoves water to prevent corrosionRemoves water from the fuel system
LubricityNot a stated featureCleans and lubricates the fuel system; improves lubricity
Sludge and oxidationProtects against gum and varnishPrevents sludge and sediment; reduces oxidation from thermal breakdown
Ratings4.8 of 5 from 1,255 ratings5 of 5 from 9 ratings

Price history

  • STA-BIL Storage Fuel Stabilizer 8 Oz.: lowest $6.78 on Nov 4 at Walmart.
  • STA-BIL Diesel Fuel Stabilizer: lowest $21.99 on Nov 4 at Amazon.

Prices at every store

STA-BIL Storage Fuel Stabilizer 8 Oz.

  • O'Reilly Auto PartsNew

    In stock

    $8.99Observed at 4:06 PM
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  • WalmartNew

    In stock

    $6.78+ $6.99 shippingObserved at 4:06 PM
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  • Gold Eagle Co.New

    In stock

    $8.49+ $8.00 shippingObserved at 4:06 PM
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  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $6.78Observed at 4:07 PM
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Also available at

  • eBayCheck price at eBay
  • WalmartCheck price at Walmart
All 6 stores and price history →

STA-BIL Diesel Fuel Stabilizer

  • The General Store SpokaneNew

    In stockReturn policy

    $27.99Observed at 4:06 PM
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  • eBayNew

    In stockSold by marine_parts_source

    $26.39+ $12.95 shippingObserved at 4:07 PM
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  • Boat OutfittersNew

    In stock

    $28.45+ $33.34 shippingObserved at 4:07 PM
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  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $21.99Observed at 4:07 PM
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Also available at

  • eBayCheck price at eBay
  • Factory Hardware StoreCheck price at Factory Hardware Store
  • WalmartCheck price at Walmart
All 6 stores and price history →

Specs compared

SpecSTA-BIL Storage Fuel Stabilizer 8 Oz.STA-BIL Diesel Fuel Stabilizer
multipack_quantity11
colorMulticolorOrange
size8 ozGallon
Engine TypeGasolineAll diesel engines
Product Type—Fuel Additive, Fuel Stabilizer
Compatible Fuel Type—Diesel
System Compatibility—Fuel system
Vehicle Type—Car
Material Compatibility—Fiberglass fuel tanks
Compatible With Other Fluids—Water
Boiling Point—Greater Than 200 F
Freezing Point—-40 F
Show all 27 specsShow fewer specs
SpecSTA-BIL Storage Fuel Stabilizer 8 Oz.STA-BIL Diesel Fuel Stabilizer
Protection Provided—Corrosion protection
Temperature Range—Varying marine conditions
Corrosion Protection—Yes
Additive Type—Fuel Stabilizer
Cleaning—Yes
Efficiency Benefits—Improved performance
Lubrication—Yes
Lubricity Improvement—Yes
Stability—Reduces oxidation of diesel fuel caused by ther…

What reviewers say

STA-BIL Storage Fuel Stabilizer 8 Oz.

Owners rate it 4.8 out of 5 from 1,255 ratings. Most use it for winter storage of mowers, generators and boats and report easy starts in spring.

Pros
  • Engines start easily after months of storage
  • Prevents carburetor gum and varnish
  • Easy to measure and pour
  • Works well with ethanol-blend fuel
Cons
  • Bottle size is small for large fuel tanks
  • Price per ounce is higher than bulk sizes
  • Does not fix a carburetor that is already clogged

STA-BIL Diesel Fuel Stabilizer

Rated 5 out of 5 from 9 ratings, a small sample. Owners use it mainly for stored and seasonal diesel and report easier starts and cleaner fuel systems.

Pros
  • Easy starts after storage
  • Keeps fuel fresh over winter
  • Cleans and lubricates the fuel system
Cons
  • Small bottle for the price
  • Dosing takes care on large tanks

Questions and answers

Which one should I use for a boat stored over winter?
Match the fuel. A gasoline inboard or outboard takes the 8 oz Storage formula; a diesel engine takes the Diesel formula. Using the wrong one does not protect the fuel.
Is the diesel version worth three times the price?
They treat different fuels, so price is not the comparison. If you have a diesel, the $21.99 bottle is the only one of the two that is correct for it.
Can I use the gasoline STA-BIL in my diesel truck?
No. The Storage 8 oz is labeled for gasoline engines. Use the Diesel formula for any diesel, including biodiesel blends.
How much fuel does each bottle treat?
The 8 oz gasoline bottle treats up to 20 gallons. The diesel listing does not state a dose per gallon, so check the bottle label for the 32 oz ratio.
Does either one clean the fuel system?
The gasoline formula cleans carburetors and injectors. The diesel formula cleans and lubricates the entire fuel system and reduces oxidation.
Which has better reviews?
The gasoline bottle has 4.8 of 5 from 1,255 ratings; the diesel has 5 of 5 from just 9. The gasoline sample is far larger.
Volume
—
32 oz
Form Type—Liquid
Package Size—32 oz
Container Type—Bottle
Climate Suitability—Year-round protection
Chemical Composition—STA-BILizers