Fuel & Additives
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Yamaha Ring Free Plus Fuel Additive - ACC-RNGFR-PL-32
$69.99 -
ValvTect BioGuard Diesel Plus 6 Fuel Treatment - 32 oz - BGDP632
$49.99 -
Seafoam Motor Treatment and Spray Combo - SF-SS
$29.99 -
Sta-Bil Diesel Stabilizer - 32 oz - 22254
$28.99 -
MDR Ethanol Gasoline E-Zorb Water Remover - 16 oz - MDR-574
$27.99 -
Star Brite Diesel Water Absorber - 084616
$25.55 -
MDR Gasoline Water Zorb Water Absorber - 16 oz - MDR-567
$24.99 -
ValvTect Diesel Guard Supreme Plus High Performance Diesel Additive - DFMS32
$24.99 -
Hammonds BioborMD Diesel Fuel Additive - BBMD16EZ01US
$23.99 -
MDR Diesel Fuel Water Zorb Water Absorber - 16 oz - MDR-559
$23.99 -
Hammonds BioborJF Diesel Fuel Additive
$21.99 - $29.99 -
Yamaha Ring Free Plus Fuel Additive - ACC-RNGFR-PL-12
$21.99 -
Seafoam Ultimate Oil Stabilizer - OS32
$21.93 -
Star Brite Star Tron Ring Cleaner - 95616
$18.02 -
Star Brite Star Tron Diesel Additive
$17.31 - $46.99 -
Seafoam High Mileage Motor Treatment - HM16
$16.71 -
Seafoam Marine PRO Engine Fuel Treatment - MP20
$15.22 -
Star Brite Star Tron Enzyme Fuel Treatment for Gasoline
$14.22 - $35.99 -
Mercury Quickleen Gasoline Engine Treatment - 12 oz - 8M0047931
$13.99 -
Seafoam Motor Treatment
$13.78 - $95.99 -
Star Brite Star Tron Enzyme Fuel Treatment - Diesel Automotive Formula - 14408
$12.41 -
Star Brite EZ Store EZ Start Diesel Storage Additive - 084408
$12.11 -
7% off
BRP Carburetor and Choke Cleaner - 777191
$12.99$11.99 -
Mercury Quickare Gasoline Fuel Treatment - 12 oz - 8M0047930
$11.99 -
Sta-Bil 360 Marine Formula Ethanol Gasoline Treatment
$10.89 - $27.99 -
BRP 2+4 Gasoline Fuel Conditioner and Stabilizer - 8 oz - 766216
$9.99 -
Star Brite Star Tron Stabilizer+ Fuel Storage
$8.68 - $14.64 -
Seafoam Fuel Injector Cleaner and Upper Cylinder Lubricant - IC5
$8.33 -
TruFuel 100% Ethanol-Free 4-Cycle Fuel
$7.99 -
Star Brite Star Tron Enzyme Fuel Treatment - Small Engine Formula - 14301
$6.89 -
15% off
Liqui Moly Marine Super Diesel Additive
$8.00$6.80 -
Star Brite Star Tron Fuel System & Injector Cleaner - 96604
$6.73 -
25% off
Star Brite EZ-to-Store EZ-to-Start Gasoline Stabilizer
$7.99 - $21.99$5.99 - $21.99 -
14% off
Sta-Bil Gasoline Fuel Stabilizer
$6.99 - $18.45$5.99 - $18.45 -
ValvTect Marine Gasoline Additive
$5.00 - $28.99 -
Liqui Moly Marine Gasoline Stabilizer Shooter - 25100
$5.00 -
32% off
Liqui Moly Marine 4T Additive Shooter - 25102
$7.41$4.99
About Fuel & Additives
What are fuel additives & engine treatments?
One of the biggest problems with boating fuel and the need for engine treatments are interactions with polymer components in the boat's fuel system and water issues.Being out on the water all day gives your boat excessive exposure to water, and that will play havoc with many of your systems.
Water helps facilitate corrosion, as well as the physical properties of water means that with excessive heat and cold, water can expand and get into all sorts of nooks and crannies of your motors and mechanical parts.
Engine treatments are an important part of eliminating this with proper lubrication, fuel stabilization, and winterization are a must for marine engines.
Otherwise, over time, water can begin to promote oxidation and even pitting throughout your engines.
Organic material might also propagate, which can cause blockages, as well as bad fuel which will ruin your engines.
Fuel additives are extremely effective at solving these problems.
Which is why Defender offers a wide variety of marine-specific additives to keep your boat running smoothly.