A reader asks: Is it OK to use AMSOIL Dominator 2-Stroke Racing Oil in my Johnson 15-horsepower outboard engine?
Our answer: No, AMSOIL Dominator would not be an appropriate choice for your outboard engine. AMSOIL has a few outstanding options for your outboard motors (see below). Dominator is a great oil for racing, but not suitable for outboard motors.
Dominator was developed for racing and/or heavily modified two-stroke engines only. This oil is designed to provide protection at exceptionally high operating temperatures. Therefore, even stock snowmobiles and dirt bikes may not run hot enough to completely burn the Dominator formula.
Also, AMSOIL did not add much in the way of detergents to Dominator. The reason for this is that racing engines are frequently torn down.
Therefore, a cool-running 2-stroke outboard engine could have two problems with running Dominator. First, outboards will not run anywhere near hot enough to completely burn the racing formulation. Second, Dominator does not offer detergents to clean up the resulting deposits from incomplete oil burning.
To sum up, the result of using Dominator in outboards could be significant deposit build-up and eventual operational problems. Dominator is a world-class racing oil. But it does not belong in an outboard engine.
Correct AMSOIL Two-Cycle Oil For Outboard Motors
AMSOIL Synthetic Two-Stroke Injector Oil is a versatile option for marine and dryland applications. It is superb as a premix in older outboard engines. It is also suitable as an injector oil. This full-synthetic oil can also be used in snowmobiles, personal watercraft and much more.
HP Marine Synthetic 2-Stroke Injector Oil is AMSOIL’s ultra-premium option for two-stroke marine applications. It can be used in the very latest 2-cycle engines (such as Evinrude E-TEC). HP Marine can also be used as a premix at 50:1. HP Marine delivers the ultimate in wear protection, deposit control and low-aquatic toxicity.
Saber Outboard is a premium synthetic product for outboard premix-only oil. Provides steadfast wear control, optimum throttle response and low-smoke in older outboard motors. Saber Outboard is sold in the USA only.
Questions? Contact us using the form on this page or call us at 1-800-748-5781.