Tag Archive for: outboard

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Replacement For Mercury Optimax DFI 2-Cycle Oil

AMSOIL HP Marine 2-Stroke Injector OilA reader asks: I’ve got a Mercury Optimax 150 outboard motor. Do you have a substitute for Mercury Optimax 2-Stroke Oil?

Our answer: Yes, we most certainly do. AMSOIL HP Marine Synthetic 2-Cycle Injector Oil is a world-class outboard 2-stroke engine oil. We contend that this product is an upgrade over the synthetic-blend Optimax 2-Cycle Oil from Mercury. We can offer this product at a price that is lower than Optimax oil in many cases.

Why Mercury Optimax Motors Require A Quality Injector Oil

Mercury Optimax engines are direct-injected motors that utilize fairly sophisticated technology. The hallmark of the Optimax system is the injection of atomized fuel-air mixture into the combustion chamber (rather than fuel only). The injected fuel droplets can be smaller than 5 microns at low-RPM.

Optimax motors also enhance efficiency by varying the fuel/oil ratio depending on RPM and load. At full throttle, the mix can be as rich as 44:1. At low RPM, the mix rate is as lean as 400:1. Therefore, not just any 2-cycle injector oil is up to the task.

Optimax engines also require an oil with a strong detergent content. Above all, prevention of engine deposits is paramount for maintaining proper performance and efficiency.

About AMSOIL HP Marine

AMSOIL HP Marine Synthetic 2-Stroke Injector Oil is a top-tier product designed for modern DFI 2-cycle outboard motors. The full-synthetic formula and robust additive ingredients provide maximum protection in direct-fuel-injected (DFI) motors. Modern 2-stroke motors like Mercury Optimax and Evinrude E-TEC can operate with ultra-lean mix ratios. HP Marine delivers maximum wear protection under these harsh operating conditions.

This product also provides powerful detergents, keeping engine internals and exhaust ports clean. HP Marine offers low aquatic toxicity along with minimal exhaust smoke and odor.

HP Marine is also backward compatible with older 2-cycle outboard motors.

Where to Buy AMSOIL HP Marine Synthetic 2-Stroke Oil?

Oildepot can offer HP Marine at wholesale prices in the US and Canada. Contact us for wholesale price list using the form on this page. If you have questions, feel free to call us at 1-800-748-5781.

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Can You Use AMSOIL Dominator 2-Stroke Oil In An Outboard Motor?

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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. 

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Two-Stroke Oil For Drag-Racing Yamaha Outboard Engine?

A reader asks: I have a question regarding 2-stroke outboard engine oil for racing. My engine is a modified, high-compression, 40-horsepower Yamaha. This motor is used only for drag racing. During races, it runs up to 8000 rpm.

Would AMSOIL Dominator 2-Stroke Racing Oil work well? Or would AMSOIL Interceptor be a better option for this engine?

AMSOIL Interceptor Synthetic 2-Stroke OilOur answer: First, let us preface our answer by mentioning that the following oil recommendations apply to racing situations only. Stock outboard engines would require a different oil. This is important and we’ll touch on that below. Both Dominator and Interceptor will provide superb wear protection for your racing outboard. But because of the racing/marine operating conditions, we would lean toward Interceptor.

Marine engines are still apt to run cooler and operate at lower rpm than 2-stroke engines used on dry land (even in this racing application). Think motocross or kart racing engines that run at 12,000-plus rpm. Therefore, your racing outboard engine will still be prone to engine deposits.

Interceptor contains a large amount of detergents. The motivation for the high detergent content is to keep snowmobile power valves clean. So, you would see cleaner engine internals with Interceptor over Dominator.

Dominator is a “racing-only” 2-stroke formula. It was designed for dry land racing engines that are torn-down frequently. Dominator should be used only in modified engines that run at extremely hot operating temperatures. Therefore, less detergents are required.

Interceptor will deliver all of the wear control needed. Plus it will ward off deposits and prevent plug fouling.

For marine engines in stock trim, do not use Interceptor or Dominator. For normal marine conditions, depositing and plug-fouling could be the result.

What About Oil For Outboard Engines Under Normal Use?

Important: Stock 2-stroke outboard engines should use HP Marine or AMSOIL Synthetic Injector Oil. Both will provide exceptional wear protection and resist engine deposits.

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A 100:1 Oil For Yamaha 2-Stroke Outboard Motor?

AMSOIL HP Marine Synthetic 2-Stroke OilA readers asks: I’ve got a 2009 Yamaha 20MLHH 2-stroke, 20 horsepower outboard engine. Yamaha recommends a 100:1 mix ratio. I see that AMSOIL HP Marine has a recommended premix ratio of 50:1. I feel that this ratio is too rich for this engine. Is there any way I can get the 100:1 AMSOIL Saber Outboard Oil in Canada? 

Our answer: Your Yamaha outboard engine can easily use AMSOIL HP Marine at 100:1. It can replace the OEM Yamalube 2M TC-W3 2-stroke oil (with less exhaust smoke). It is true that Saber Outboard Premix Oil is no longer offered in Canada. However, HP Marine is certainly not a downgrade for your engine.

While HP Marine has a suggested mix ratio of 50:1 on the label, it is no stranger to ultra-lean mix ratios. HP Marine has been heavily tested in Evinrude E-TEC engines at the “lean-mix” setting. This is the equivalent of an approximate 100:1 ratio. AMSOIL’s extensive testing under extreme loads at this lean-mix setting proves that it delivers outstanding wear protection.

Yamalube 2M TC-W3 2-stroke oil is only a partial-synthetic product. HP Marine is a 100% synthetic formula that offers the very latest two-stroke marine oil technology. Therefore, we would rate it as a considerable step up over the Yamalube product.

Features Of AMSOIL HP Marine

  • Low-smoke and odor
  • Robust synthetic wear protection
  • Resists carbon build-up
  • Provides excellent throttle response
  • Low aquatic toxicity
  • Protects against internal anti-rust and corrosion
  • For premix or oil-injected marine two-cycle engines

For US customers that have access to Saber Outboard, it is also an excellent choice for Yamaha outboards requiring a 100:1 premix ratio.

If you have questions or would like to request prices, contact us using the form on this page or call us at 1-800-748-5781.

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