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Additives

Buy Marine Fuel Additives & Engine Treatments

Explore our premium range of marine fuel additives and engine treatments designed to improve performance, prevent corrosion, and extend the life of your boat’s systems. From fuel stabilisers to ethanol treatments and Volvo neutralising agents, our additives keep your engines running efficiently and reliably.

  • Volvo Neutralising Agents: Protect your engine from corrosion with genuine Volvo neutralising agents, available in 3.8L and standard sizes.
  • Fuel Stabilisers: Keep your fuel fresh during storage periods and prevent gum or varnish build-up in tanks and injectors.
  • Ethanol Fuel Treatments: Counteract ethanol-related corrosion and phase separation, available in 8 oz., quart, and gallon sizes.
  • Probiotic Wastewater Tank Treatments: Maintain hygiene, reduce odours, and improve efficiency in onboard wastewater systems.

Shop, explore, and find the right additives to protect your marine engine, prevent damage, and keep your boat in peak condition.

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  • ProPower Marine Probiotic Wastewater Tank Treatments ProPower Marine Probiotic Wastewater Tank Treatments

    ProPower Marine Probiotic Wastewater Tank Treatments

    ProPower Marine Probiotic Wastewater Tank Treatment Available in 500ML and 1L ProPower Marine prevents odours in boat toilet systems. Some of the biggest names in boat manufacturing now recommend and supply ProPower. Wastewater systems are a continual...

    $39.55 - $66.00
  • Fuel Stabiliser - 473ml

    Fuel Stabiliser - 473ml

    Fuel Stabiliser - 473ml Part#: S-18-9065 Please Note: All oils and coolants will be shipped road freight or alternatively are available for pick up from our Sydney (Northern Beaches) fullfilment centre. Sierra Marine fuel stabilizer promotes quick...

    $19.75
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  • Ethanol Fuel Treatment and Stabilizer - 8 Oz.

    Ethanol Fuel Treatment and Stabilizer - 8 Oz.

    Ethanol Fuel Treatment and Stabilizer - 8 Oz. Part#: S-18-9775 Please Note: All oils and coolants will be shipped road freight or alternatively are available for pick up from our Sydney (Northern Beaches) fullfilment centre.   Stabilizes E10...

    $13.76
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  • Ethanol Fuel Treatment and Stabilizer - Quart

    Ethanol Fuel Treatment and Stabilizer - Quart

    Ethanol Fuel Treatment and Stabilizer - Quart Part#: S-18-9776 Please Note: All oils and coolants will be shipped road freight or alternatively are available for pick up from our Sydney (Northern Beaches) fullfilment centre. Stabilizes E10 gasoline for...

    $37.35
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  • Ethanol Fuel Treatment and Stabilizer - Gallon

    Ethanol Fuel Treatment and Stabilizer - Gallon

    Ethanol Fuel Treatment and Stabilizer - Gallon Part#: S-18-9777 Please Note: All oils and coolants will be shipped road freight or alternatively are available for pick up from our Sydney (Northern Beaches) fullfilment centre. Stabilizes E10 gasoline for...

    $128.67
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  • 21687793 - Genuine Volvo Neutralising Agent

    21687793 - Genuine Volvo Neutralising Agent

    Volvo Penta - Neutralising Agent Please Note: All oils and coolants will be shipped road freight or alternatively are available for pick up from our Sydney (Northern Beaches) fullfilment centre.

    $78.76
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