TWO STROKE
NO GUESSWORK
Technical information for dirt bikes, snowmobiles, boats, racing engines, power equipment and Detroit Diesel two-strokes. Learn how they work, choose the right oil and get the fuel-to-oil ratio right every time.
Two-Stroke Information by Application
A two-stroke dirt bike does not operate under the same conditions as an outboard motor, chainsaw or Detroit Diesel. Start with the application and work backward to the correct oil, ratio and maintenance practices.
Dirt Bikes
Premix ratios, transmission oil, spark plugs, jetting, top-end maintenance and two-stroke motorcycle oil.
Explore Dirt Bikes 02Snowmobiles
Injection oil, cold-weather flow, exhaust power valves, storage and modern two-stroke snowmobile engines.
Explore Snowmobiles 03Marine
TC-W3 oil, outboard premix ratios, direct injection, corrosion protection and seasonal storage.
Explore Marine 04Racing
High-output engines, premix tuning, deposit control, fuel selection and severe-duty lubrication.
Explore Racing 05Power Equipment
Chainsaws, trimmers, blowers, augers, generators and other air-cooled two-stroke equipment.
Explore Equipment 06Detroit Diesel
Series 53, 71, 92 and 149 two-stroke diesel engines, including oil requirements and operating characteristics.
Explore Detroit DieselDetroit Diesel Two-Stroke Engines
Detroit Diesel built some of the most recognizable two-stroke diesel engines ever used in trucks, buses, military equipment, boats, generators and industrial machinery.
Detroit Two-Stroke Families
Two-Stroke Oil Is Not One-Size-Fits-All
The correct oil depends on how the engine is lubricated, cooled and operated. Brand matters less than using an oil built for the actual engine and service conditions.
Use the Correct Mix
More oil is not automatically better. An incorrect premix can affect combustion, deposits, jetting, smoke and engine life.
Match the Oil Standard
Air-cooled equipment, water-cooled outboards and performance motorcycles may require completely different oil chemistry.
Consider How It Is Used
A racing engine held wide open has different needs than a trolling outboard, snowmobile or landscaping tool.
Looking for Two-Stroke Oil?
Compare oil by application and manufacturer specification before buying. AMSOIL offers options for premix, injection, racing, marine and power-equipment applications.
Stop Guessing at Your Premix
Choose your fuel amount and desired ratio. The calculator gives you the correct oil quantity in seconds.
Calculate Your Mix