AMSOIL 100:1 PRE-MIX 100% SYNTHETIC 2-STROKE OUTBOARD OIL

AMSOIL 100:1 Pre-Mix 100% Synthetic 2-Stroke Outboard Oil is a purpose-built marine lubricant that delivers full wear protection at ultra-lean mix ratios, burning so cleanly that it produces fewer emissions at 100:1 than conventional oils mixed at 50:1. It is designed for boaters, anglers, and personal watercraft owners who run two-stroke outboard motors and want less smoke, cleaner spark plugs, and sharper throttle response on the water.

Two-stroke outboard engines operate in one of the harshest lubrication environments imaginable. Saltwater spray, constant humidity, and wide-open throttle runs create conditions that accelerate rust, carbon buildup, and ring sticking. Conventional two-stroke oils often leave behind heavy deposits at standard 50:1 ratios, fouling spark plugs and restricting exhaust ports. The result is rough idling, sluggish throttle response, and visible smoke trails that no one on the water wants to deal with.

CLEAN COMBUSTION AT 100:1 MIX RATIOS
Running a leaner oil-to-fuel ratio means less unburned oil passing through the combustion chamber. AMSOIL Synthetic 2-Stroke Outboard Oil is formulated with advanced synthetic base stocks that provide full lubricity and anti-wear protection even at 100:1 pre-mix, half the oil concentration of a standard 50:1 mix. The result is dramatically reduced smoke and exhaust emissions. For anyone running a two-stroke Johnson, Yamaha, Mercury, or Evinrude outboard, this translates to cleaner operation at the dock, at idle, and at full throttle.

PREVENTS PLUG FOULING AND EXHAUST PORT BLOCKAGE
Carbon deposits are the enemy of reliable two-stroke performance. AMSOIL engineered this oil with low-temperature dispersants specifically designed to reduce varnish and carbon accumulation on spark plugs, piston rings, and exhaust ports. Plug fouling is one of the most common complaints among two-stroke outboard owners, and it almost always traces back to oil that does not burn cleanly. This formulation attacks the root cause. Cleaner combustion means spark plugs stay serviceable longer, rings move freely, and exhaust ports remain clear.

IMPROVED IDLING AND THROTTLE RESPONSE
A two-stroke outboard that stumbles at idle or hesitates on throttle application is often fighting deposit-related restrictions. By keeping combustion chamber surfaces clean, AMSOIL Synthetic 2-Stroke Outboard Oil supports consistent ignition timing and smooth fuel delivery across the entire RPM range. The improvement is most noticeable in carbureted outboards where deposit buildup tends to compound over time.

RUST AND CORROSION INHIBITION FOR MARINE ENVIRONMENTS
Marine engines sit in or near water for extended periods, and internal corrosion can begin as soon as the engine cools down. AMSOIL Synthetic 2-Stroke Outboard Oil includes corrosion inhibitors that coat internal metal surfaces and resist the moisture intrusion that is unavoidable in marine applications. This protection matters during operation and during storage between trips.

MAXIMIZES TORQUE AND POWER
Less oil in the fuel mixture means more efficient combustion and less energy lost to burning excess lubricant. At 100:1, the engine runs on a fuel charge that is closer to pure gasoline while still receiving full lubrication. This supports maximum torque and power output from the engine, particularly at wide-open throttle where two-stroke outboards spend much of their operating life.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL Synthetic 2-Stroke Outboard Oil meets the TC-W3 specification and is suitable for use in any two-stroke outboard motor, personal watercraft, or jet boat that calls for TC-W3 oil. It can be pre-mixed at 100:1 for maximum performance regardless of the manufacturer's specified ratio. Richer ratios such as 80:1 or 50:1 may also be used if preferred. The product is Warranty Secure, meaning it will not void your factory warranty when used as directed.

MIXING GUIDE

Ratio	Oil	Fuel
50:1	2.6 oz.	1 U.S. Gallon
80:1	8.0 oz.	5 U.S. Gallons
100:1	8.0 oz.	6 U.S. Gallons

TYPICAL TECHNICAL PROPERTIES

Property	Value	Test Method
Kinematic Viscosity @ 100°C, cSt	14.5	ASTM D445
Kinematic Viscosity @ 40°C, cSt	111.2	ASTM D445
Viscosity Index	133	ASTM D2270
Pour Point, °C (°F)	-37 (-35)	ASTM D97
Flash Point, °C (°F)	174 (345)	ASTM D92
Fire Point, °C (°F)	234 (453)	ASTM D92