What is the shelf life of this product?

They are sealed so expect a shelf life of a few years.

How many oz for 26 gal fuel tank

Each of these bottles treat 30 gallons. The approximate dosage is 1 ounce for every four gallons. If your fill up is about 16 gallons put in 4 ounces (1/2 bottle). If your fill up is 20 gallons put in 5 ounces. Basically take the gallons added to the tank and divide by 4. Round up or down to the nearest ounce.

Is this also an anti gel?

Yes, it includes Cold Weather Protection – improves diesel pour point up to 40°F (22°C), and cold filter plug point by up to 25°F (13°C), depending on base fuel

Should I had it to my empty tank, then fill it with fuel, or fill first, then dump in the bottle?

I pump a few gallons in if empty (which I don't recommend for fuel system health) them complete the fill up with diesel fuel.

4 Bottles Of Stanadyne 38564 Performance Formula 8 Oz Diesel

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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¥14217

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Unlock horsepower and fuel savings with every drop!

ENGINE GUARDIAN - Lubricates and cleans injectors, preventing wear and corrosion for long engine life.
ECO SMART FORMULA - Reduces emissions and is safe for ULSD and B20 biodiesel blends.
POWER UP YOUR DRIVE - Restores and increases horsepower for peak engine performance.
FUEL EFFICIENCY MASTERY - Proven 4% MPG improvement saves you money on every mile.
WINTER PROOF YOUR DIESEL - Anti-gel formula protects fuel flow down to -40°F for worry-free cold starts.

Stanadyne 38564 Performance Formula is a premium diesel fuel additive designed to boost horsepower by up to 9.6%, improve fuel economy by 4%, and protect your engine in extreme cold down to -40°F. It cleans and lubricates fuel systems, prevents corrosion, and is compatible with ultra-low sulfur diesel and biodiesel blends up to B20, ensuring enhanced performance and longevity while reducing emissions.

Specifications

ASIN	B01BXECJ7S
Best Sellers Rank	#9,365 in Automotive ( See Top 100 in Automotive ) #19 in Diesel Additives
Brand	Stanadyne
Customer Reviews	4.6 4.6 out of 5 stars (400)
Date First Available	February 18, 2016
Item Weight	0.01 ounces
Manufacturer	Stanadyne
Manufacturer Part Number	24349
Product Dimensions	13 x 11 x 2 inches

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