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MDR
MDR Stor-N-Start Gas

MDR Stor-N-Start Gas

Best price now

$6.99at Hardin MarineObserved at 4:06 PM

24% under what the other stores charge

Compared across 4 stores. Prices are checked against each store and labelled with when.

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Our take on the MDR Stor-N-Start Gas

MDR Stor-N-Start Gas is a 4 oz fuel additive for gasoline engines, sold mainly for marine and small-engine use. It is formulated to prevent deposits and keep fuel systems clean during storage and regular running. At $6.99 at Hardin Marine as of November 4, 2026, it is the lowest new price among the four stores that carry it.

Best forBoat owners winterizing outboard or inboard gas enginesSmall-engine owners storing mowers, generators or trimmersBuyers who want a low-cost fuel stabilizer and cleaner in one bottle
Pros
  • One 4 oz bottle treats a typical tank, so a little goes far
  • Combines deposit prevention with fuel-system cleaning
  • Low entry price at $6.99
  • Small bottle is easy to store on a boat or in a garage
Cons
  • 4 oz is a small volume; larger boats need multiple bottles
  • Gasoline-only formula, not for diesel engines
  • No stated treat rate on the label data, so dosing needs care
  • Limited availability: only four stores price it new

MDR Stor-N-Start Gas prices at every store

  • Hardin MarineNew

    In stock

    $6.99Observed at 4:06 PM
    Visit store
  • Boats.netNew

    In stock

    $8.36Observed at 4:06 PM
    Visit store
  • eBayNew

    In stockSold by freeportmarine

    $9.19Observed at 4:06 PM
    Visit store
  • WalmartNew

    In stockSold by Boating Store

    $18.77Observed at 4:06 PM
    Visit store

Also available at

  • eBayCheck price at eBay
  • MarineEngineParts.comCheck price at MarineEngineParts.com
  • Explosive PowersportsCheck price at Explosive Powersports
  • BoatplicityCheck price at Boatplicity
  • CP PerformanceCheck price at CP Performance
  • Freeport Marine SupplyCheck price at Freeport Marine Supply
  • Harvey Cedars MarinaCheck price at Harvey Cedars Marina
  • Jamestown DistributorsCheck price at Jamestown Distributors
  • Sea Gear MarineCheck price at Sea Gear Marine

MDR Stor-N-Start Gas price history

Lowest price we've seen: $3.00 on Nov 4 at MarineEngineParts.com. Tracked across 12 stores since Nov 4.

Specifications

Package Size
4 oz
Primary Use
Cleaning
Volume
4 oz
Additive Function
Prevents deposits
Cleaning
Yes

Questions and answers

Is MDR Stor-N-Start Gas worth it?
At $6.99 for 4 oz it is a cheap way to protect a gas engine during storage. If you store fuel for months, a dedicated stabilizer with a clear treat rate may be easier to dose.
How much fuel does one 4 oz bottle treat?
MDR does not publish a treat rate in the product data, so check the bottle label before mixing. Buy two bottles if you are treating a tank larger than a few gallons.
Can I use it in a diesel engine?
No. It is a gasoline additive; use a diesel-specific conditioner for diesel fuel.
Is it a stabilizer or a cleaner?
It is marketed for both: it prevents deposits and cleans the fuel system. For long-term storage, confirm on the label that it stabilizes fuel.
When is the best time to buy it?
Prices are steady across the four stores, with $6.99 at Hardin Marine as of November 4, 2026. Buy before winterizing season, when demand for fuel additives rises.
Where is the MDR Stor-N-Start Gas cheapest?
At Hardin Marine, for $6.99, 24% under what the other stores charge, as of our latest check.
Where can I buy the MDR Stor-N-Start Gas?
12 stores we checked sell it, including eBay, Hardin Marine, Boats.net, Walmart, MarineEngineParts.com.