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AMSOIL Synthetic 2-Cycle Injector Oil

Synthetic 2-Cycle Oils

Reduce friction and wear, improve throttle response and deliver maximum power. Clean-burning ashless formulations prevent plug fouling and carbon deposits. Deliver quick, dependable starts. Reduce smoke and emissions and won't "load up" during prolonged idling. Provide outstanding cold temperature flow. Contain special anti-rust agents for off-season storage. Product Code: AIO

Maximum protection for:

  • Outboard motors
  • Snowmobiles
  • Motorcycles
  • All air-cooled and water-cooled 2-cycle engines.
  • Chainsaws
  • ATVs

"I'm very impressed with AMSOIL 2-Cycle Oil. Even after several hours of heavy-duty towing at low speed, my outboard never misses a beat."

J.C., Marco Island, Florida


Meet or Exceed the Following

  • API TC-3, TD-3, TD-4


AMSOIL Synthetic 2-Cycle Oils are superior quality lubricants which provide maximum protection and outstanding performance in virtually all two-cycle gasoline engines. AMSOIL Synthetic 2-Cycle Oils provide lower engine temperatures, higher power output and cleaner operation than conventional oils provide. AMSOIL Synthetic 2-Cycle Oils also provide maximum oxidation protection, anti-corrosive characteristics and improved starting in low temperatures.

AMSOIL Synthetic Injector 2-Cycle Oil is formulated for use in all injector-type two-cycle gasoline engines. It may also be used as a pre-mix at the manufacturer's recommended mix ratio.

AMSOIL Synthetic 100:1 2-Cycle Oil is formulated for pre-mixing with gasoline at a fuel/oil mix ratio of 100:1.

Resist Thermal Breakdown from Heat

AMSOIL Synthetic 2-Cycle Oils resist oil breakdown caused by heat to prevent the formation of varnish and carbon deposits. AMSOIL 2-Cycle Oils also lower engine temperatures to inhibit power-robbing thermal expansion in hard-driven engines. The protection given to engine components reduces maintenance costs.

Resist High Temperature Deposits

AMSOIL Synthetic 2-Cycle Oils promote clean burning. They form no gum, varnish, sludge, carbon or ash residues. Deposits previously formed from conventional oils are often dissolved. Spark plug fouling and excessive carbon build-up on piston domes and exhaust ports are virtually eliminated. Rings remain free for excellent compression and combustion, and exhaust emissions are greatly reduced.

Reduce Wear Throughout the Engine

AMSOIL Synthetic 2-Cycle Oils protect pistons and rings from wear caused by metal-to-metal contact under the hottest loaded conditions. The lubricity properties in AMSOIL 2-Cycle Oils provide a durable film that protects moving parts against wear. Also, AMSOIL Synthetic 2-Cycle Oils reduce friction to lower engine operating temperatures.

Outstanding Low Temperature Performance

AMSOIL Synthetic 2-Cycle Oils mix readily with fuel, even in low temperatures. AMSOIL SYnthetic 2-Cycle Oils resist gelling to provide excellent performance and protection in low temperatures.

Prevents Rust and Corrosion

AMSOIL Synthetic 2-Cycle Oils contain special rust and corrosion inhibitors which provide two-cycle engines with excellent protection, especially during off-season storage.


AMSOIL Synthetic 2-Cycle Oils exceed the lubrication and performance requirements of all gasoline-powered two-cycle engines built after 1960. Applications include outboard motors, motorcycles, snowmobiles.  ATVs, chainsaws, lawnmowers and more.

AMSOIL Synthetic 2-Cycle Oils surpass API TC-3, TD-3, TD-4 and NMMA TC-WII and TC-W3 performance test requirements as listed.

AMSOIL 100:1 2-Cycle Oil is not suitable for mixing with methanol or other special fuels. However, it may be used with reformulated, oxygenated or other alcohol-enhanced gasoline.


The mix ratio for AMSOIL 100:1 2-Cycle Oil is as follows:

  • 1.3 oz. oil per 1 U.S. gallon gasoline
  • 0.34 oz. oil per 1 liter gasoline
  • 8 oz. oil per 6 U.S. gallon gasoline

For AMSOIL Injector Oil, mix at engine manufacturer's recommended mix ratio in either pre-mix or oil injection systems. Engines modified for racing should use 50:1 mix ratio, with adjustments to the mix ratio being made based on head temperatures and spark plug examination.


The use of AMSOIL Synthetic 2-Cycle Oils will not void engine warranties. Warranties are based upon the use of oils meeting specific tests. AMSOIL Synthetic 2-Cycle Oils meet the current requirements as listed and thus are perfectly suited for use in any new engine without affecting the validity of the warranty.


AMSOIL INC. warrants that the use of its lubricants will not cause mechanical damage to any mechanically sound equipment when AMSOIL INC. products are used in full compliance with the company's recommendations.


AMSOIL Injector and 100:1 Synthetic 2-Cycle Oils 100:1 Oil
Injector Oil
Kinematic Viscosity @ 100C, cST (ASTM D-445) 12.6 7.5
Kinematic Viscosity @ 40C, cST (ASTM D-445) 98.3 46
Viscosity Index (ASTM D-2270) 122 129
Pour Point, C (F) (ASTM D-97) -27 (-17) -45 (-49)
Flash Point, C (F) (ASTM D-92) 225 (437) 74 (165)
Ash wt.% Nil Nil
Color Blue Blue
Biodegradability (CEC L-33-T82) N/A N/A
Passes Requirements For:
API Service Classification TD TD TD
SAE Miscibility/Fluidity Grade 3 4 3

If you want to buy AMSOIL products, visit the AMSOIL Online Store.