Fuel & Additives
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Star Brite Star Tron Enzyme Fuel Treatment for Gasoline
$20.51 - $51.00 -
Star Brite Star Tron Diesel Additive
$24.83 - $66.40 -
Yamaha Ring Free Plus Fuel Additive - ACC-RNGFR-PL-32
$98.61 -
ValvTect BioGuard Diesel Plus 6 Fuel Treatment - 32 oz - BGDP632
$70.60 -
Hammonds BioborJF Diesel Fuel Additive
$31.38 - $42.58 -
Sta-Bil 360 Marine Formula Ethanol Gasoline Treatment
$15.84 - $39.80 -
Sta-Bil Diesel Stabilizer - 32 oz - 22254
$41.20 -
ValvTect Marine Gasoline Additive
$7.60 - $41.20 -
Yamaha Ring Free Plus Fuel Additive - ACC-RNGFR-PL-12
$31.38 -
13% off
Sta-Bil Gasoline Fuel Stabilizer
$10.38 - $26.44$8.98 - $26.44 -
MDR Gasoline Water Zorb Water Absorber - 16 oz - MDR-567
$35.58 -
Hammonds BioborMD Diesel Fuel Additive - BBMD16EZ01US
$34.18 -
MDR Ethanol Gasoline E-Zorb Water Remover - 16 oz - MDR-574
$39.78 -
Seafoam Marine PRO Engine Fuel Treatment - MP20
$21.91 -
MDR Diesel Fuel Water Zorb Water Absorber - 16 oz - MDR-559
$34.18 -
Mercury Quickleen Gasoline Engine Treatment - 12 oz - 8M0047931
$20.18 -
Star Brite Star Tron Ring Cleaner - 95616
$25.83 -
Mercury Quickare Gasoline Fuel Treatment - 12 oz - 8M0047930
$17.38 -
Seafoam Motor Treatment
$19.89 - $135.03 -
23% off
Star Brite EZ-to-Store EZ-to-Start Gasoline Stabilizer
$11.78 - $31.40$8.98 - $31.40 -
7% off
BRP Carburetor and Choke Cleaner - 777191
$18.78$17.38 -
Star Brite Star Tron Enzyme Fuel Treatment - Diesel Automotive Formula - 14408
$17.97 -
ValvTect Diesel Guard Supreme Plus High Performance Diesel Additive - DFMS32
$35.60 -
Star Brite Star Tron Fuel System & Injector Cleaner - 96604
$10.02 -
30% off
Liqui Moly Marine 4T Additive Shooter - 25102
$10.97$7.58 -
54% off
Liqui Moly Marine Gasoline Stabilizer Shooter - 25100
$7.60$3.49 -
14% off
Liqui Moly Marine Super Diesel Additive
$11.80$10.12 -
BRP 2+4 Gasoline Fuel Conditioner and Stabilizer - 8 oz - 766216
$14.58 -
Seafoam High Mileage Motor Treatment - HM16
$23.99 -
Seafoam Fuel Injector Cleaner and Upper Cylinder Lubricant - IC5
$12.26 -
Seafoam Ultimate Oil Stabilizer - OS32
$31.31 -
Seafoam Motor Treatment and Spray Combo - SF-SS
$42.60 -
Star Brite Diesel Water Absorber - 084616
$36.37 -
Star Brite Star Tron Enzyme Fuel Treatment - Small Engine Formula - 14301
$10.24 -
Star Brite EZ Store EZ Start Diesel Storage Additive - 084408
$17.55 -
Star Brite Star Tron Stabilizer+ Fuel Storage
$12.75 - $21.09
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.