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Amsoil HP Marine 100% Synthetic 2-Stroke Oil

Last updated: February 22nd, 2026
Amsoil HP Marine 100% Synthetic 2-Stroke Oil

An excellent overall choice for todays modern outboard motors and PWCs, Amsoil HP injector is specifically formulated for todays fuel injected marine engines. This oil also make an excellent general use two stroke oil for snowmobiles, ATVs or pre mix applications.

Available Packaging for HPI

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This product will typically ship within 24 hours from one of Amsoils 14 distribution centers in North America.

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Amsoil HP Marine 100% Synthetic 2-Stroke Oil Frequently Asked Questions
Amsoil HP Marine is a synthetic blend two-stroke oil formulated for water-cooled outboard motors, personal watercraft and marine engines requiring NMMA TC-W3 certified oil.
Yes. Amsoil HP Marine meets NMMA TC-W3 certification requirements, ensuring compatibility with modern outboard engines and marine lubrication standards.
Yes. Amsoil HP Marine works in both oil-injected and premix marine two-stroke engines including carbureted, EFI and direct-injected outboard systems.
Marine two-stroke oils like Amsoil HP Marine are designed for water-cooled engines operating at lower temperatures and must resist corrosion, moisture contamination and deposit formation unique to marine environments.
Yes. The clean-burning formulation helps minimize smoke, exhaust residue and plug fouling common in marine two-stroke engines.
Yes. Amsoil HP Marine is compatible with both modern and older outboard engines requiring TC-W3 oil.
Yes. It is suitable for many personal watercraft applications requiring NMMA TC-W3 performance standards.
Typical premix ratios are 50:1 unless otherwise specified by the engine manufacturer. Always follow manufacturer recommendations.
Yes. Marine-specific additives help protect internal engine components against rust and corrosion caused by moisture and saltwater exposure.
Amsoil HP Marine is compatible with most TC-W3 oils, though mixing oils may reduce optimal performance benefits.
Common applications include outboard motors, personal watercraft, jet boats and other water-cooled marine two-stroke engines.
Marine oils like Amsoil HP Marine are formulated specifically for water-cooled engines and are not recommended for air-cooled equipment or high-temperature powersports engines.

The Performance Oil Company

An Authorized Amsoil Dealer
Allenton, Wisconsin 53002
(262)-388-3411