More Throttle Response

August 26, 2021

Outboard Marine
Photo by zibik on Unsplash

Boaters See Less Exhaust and More Throttle Response

Direct fuel injection (DFI) run leaner oil mix ratios to improve combustion efficiency and reduce exhaust emissions to meet EPA (Environmental Protection Agency) standards. However, these leaner gas-to-oil ratios means less oil available to provide the necessary oil film strength on cylinder wall and bearings to prevent scuffing and wear. Another problem is the degree to which a 2-stroke oil burns off. Unburnt oil leaves deposits on spark plugs, piston rings and plug exhaust ports. These deposits accumulate faster when idling or trolling the engine for any length of time. Excessive buildup is noticed with delayed throttle response, rough engine noise or excessive exhaust smoke when the engine is throttled up to max speed again. Over time these deposits become solid causing unnecessary engine wear and reduce the engine’s overall power and performance.

AMSOIL HP Marine & Marine Injector oil

AMSOIL solves these problems with its extremely high oil film strength and cleaner burning gas-to-oil fuel ratio. These 2-cycle marine oils are formulated to provide the highest oil film strength with leaner oil mix ratios compared to other leading brands. The oil burns cleaner to eliminate the problems of plug fouling, ring sticking and reduce exhaust smoke beyond EPA standards. Customers choose AMSOIL because they realize consistent throttle response and dependable engine starts. Even after prolonged idling or trolling, engines reach maximum rpm without hesitation. Oils are formulated with quality additives to provide superior oil film strength eliminating metal to metal contact and burn clean to eliminate deposit buildup. AMSOIL delivers the extra power and performance enthusiasts expect from their engine.

AMSOIL Technical questionOur customers ask: “Can I use AMSOIL HP Marine Synthetic 2-Stroke Oil in my Evinrude® E-TEC™ at the factory-lean setting?”

AMSOIL Technical: “Yes. HP Marine is excellent for Evinrude® E-TEC™ factory-lean setting. Therefore, HP Marine (HPM) can be used in place of Evinrude XD100™ brand 2-Cycle Oil.”


AMSOIL outboard marine injector oils are engineered with advanced technology specifically for marine two-stroke engine applications. Use the oil as per-mix fuel, or as direct fuel injection for marine engines with factory-lean setting.

2-Stroke HP Marine

Customer Review

25W-40 marine

2-Stroke Marine Injector
Oil (AIO)

Customer Review

2-stroke injector oil

2-Stroke 100:1 Marine
Pre-Mix (ATO)

Customer Review

100 to 1 premix

Marine Gear Lube
75W-90 (AGM)

Customer Review

marine gear lube


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