2-Stroke Engine Oil
Superior synthetic protection for dirt bikes, snowmobiles, outboards, small engines, and racing equipment.
Calculate Your Mix Ratio
Know your equipment and fuel volume? Get your exact oil amount in seconds. Metric or US units. Free, mobile-friendly, no login.
Open Calculator Now →Why Synthetic 2-Stroke Oil
Two-stroke engines burn oil with every power stroke. That means your oil choice directly affects ring wear, carbon buildup, plug fouling, and engine longevity.
Conventional mineral oils leave deposits and varnish. Synthetic 2-stroke oils clean better, protect longer, and often cost less per hour of operation — despite the higher bottle price.
- Superior detergency — reduces carbon, deposits, and varnish in rings, ports, and spark plugs
- Lower ash content — cleaner plugs, better fuel economy, cooler running temperatures
- Stable viscosity — performs consistently from cold starts to sustained high-RPM load
- Extended service life — synthetic formulation resists oxidation and breakdown
- Better cost-per-hour — longer engine life offsets higher initial cost
Our 2-Stroke Oil Lineup
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All products ship factory-direct to the USA and Canada with no warehouse markups. Order online, get fast shipping directly from AMSOIL's distribution network.
Why Choose AMSOIL
AMSOIL 2-Stroke Oils: The Field-Tested Choice
Not all synthetic 2-stroke oils are created equal. AMSOIL 2-stroke formulations are engineered from the ground up for the harshest conditions — racing, commercial use, and real-world abuse.
- API TC-W3 and NMMA TC-W3 certified — the highest 2-stroke standard
- Superior detergency vs conventional and semi-synthetic competitors
- Lower ash content means cleaner engines and longer spark plug life
- Field-tested across dirt bikes, snowmobiles, outboards, chainsaws, and racing engines
- Backward-compatible with all small-engine manufacturers — Yamaha, Mercury, Honda, Kawasaki, Suzuki, Polaris, Arctic Cat, and vintage racing equipment
- Proven cost-per-hour advantage — synthetic protection pays for itself in engine life
Applications & Standard Mix Ratios
Most modern 2-stroke equipment runs 50:1 (fuel to oil). High-performance racing may run leaner (50:1 for peak horsepower) or richer (32:1 for maximum film strength) depending on load and conditions. Use the calculator above to determine your exact ratio.
AMSOIL Design Philosophy: 50:1 Standard
AMSOIL 2-stroke oils are engineered and tested for 50:1 — the industry standard ratio. This means you get optimal protection at the ratio you're actually using. No guesswork. No dilution concerns. Mix it at 50:1 and you're running the formulation exactly as it was designed.
Why this matters: Some synthetic competitors like Saber are designed for much leaner ratios (100:1 or beyond). That requires more understanding of your equipment and mixing precision. AMSOIL keeps it simple: 50:1 works across dirt bikes, snowmobiles, outboards, and small engines. Standard ratio. Full protection.
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32:1 to 50:1 depending on engine load. High-RPM racing often runs 50:1. Check your owner manual.
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50:1 is the modern standard. Older machines may specify 40:1. Verify your equipment manual.
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50:1 is typical for modern 2-stroke outboards from Mercury, Yamaha, Johnson/Evinrude.
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Chainsaws, trimmers, blowers: typically 40:1 or 50:1. Vintage equipment may specify 32:1. AMSOIL's 50:1 formulation works across all small-engine applications. (Note: Saber synthetics can run as lean as 100:1, but 50:1 is adequate.)
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High-performance racing demands precision. Consult your engine builder for the optimal ratio.
Quick Mix Reference Chart
Standard 2-stroke mixing ratios and how much oil to add for common fuel volumes:
| Ratio | 1 Gallon | 5 Liters | 1 Liter | Applications |
|---|---|---|---|---|
| 32:1 | 4 oz | 156 ml | 31 ml | Racing, vintage equipment |
| 40:1 | 3.2 oz | 125 ml | 25 ml | Chainsaws, trimmers, some outboards |
| 50:1 | 2.6 oz | 100 ml | 20 ml | Modern dirt bikes, snowmobiles, outboards, small engines |
Use the calculator above for precise measurements based on your exact fuel volume and desired ratio. This chart is a quick reference only.
Common Questions
Yes. AMSOIL 2-stroke oils are backward-compatible with all small-engine manufacturers and meet NMMA TC-W3, the highest 2-stroke specification. Use in any engine designed for API-certified 2-stroke oil.
Follow your equipment manual's API rating (usually TC-W, TC-W2, or TC-W3). AMSOIL 2-stroke oils meet TC-W3. You can use them wherever TC-W3 is approved.
You can, but don't. Mixing different oil types reduces the protection benefit of the superior formulation. Use one quality oil and stick with it. Empty the tank when switching brands.
Yes. AMSOIL 2-stroke oils are formulated to mix cleanly in all modern fuel types, including E10 and E15 ethanol-blended gasoline.
Usually no. Plug fouling comes from running too lean (too little oil) or running at low RPM in cold conditions. Use the calculator to confirm your oil ratio is correct.
Unopened bottles are stable for 5+ years in a cool, dark location. Once opened, use within 2 years for best performance.
Shop 2-Stroke Oil
All AMSOIL 2-stroke products ship factory-direct to the USA and Canada. Order online, get fast shipping with no warehouse markups.
Browse All 2-Stroke Products →Need help finding the right product for your equipment? Use the calculator above or contact Vyscocity for technical support.