Which Two-stroke Oil Brand Wins?
We compared 2 two-stroke oil options head to head. AMSOIL Dominator Racing 2-stroke oil came out on top. See the measured results, the runner-up, the budget pick, and a link to the full test video.
AMSOIL Dominator Racing 2-stroke oil
Price shown in test: $12.95, about four times as much as the SuperTech
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SuperTech
Price shown in test: around $3 per quart
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SuperTech
Price shown in test: around $3 per quart
Affiliate link. We may earn a commission at no extra cost to you.
The measured results
Every number below is read straight from the test. Scroll sideways to see all measurements. Products are listed in the order they finished.
| Product | Lubricity Wear Scar | Corrosion Test | Flashpoint Qualitative | Flashpoint Lab Result | Combustible Gas First Engine | Carbon Deposits First Engine | Compression Psi | Generator Load Temps | Evaporation Residue | Carbon Deposits Second Engine | Api Certification |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1AMSOIL Dominator Racing 2-stroke oil$12.95, about four times as much as the SuperTech | 17 percent smaller wear scar than the SuperTech, not even close | no visible corrosion on the coated bolt, amazing job blocking rust | ignited first in the simple crucible/flame test, about 1 minute 15 seconds before SuperTech, indicating a lower flashpoint | 225 degrees Fahrenheit per independent lab analysis (lower than SuperTech's 330 F) | 15 to 108 parts per million, much lower (cleaner burn) than SuperTech's 300 to 475 ppm | spark plug had a little more carbon buildup than SuperTech, but described overall as slightly better than SuperTech on carbon deposits due to less buildup on intake valve area | started at 85 psi new, rose to 90 psi after 4.5 hours of load testing at a 100 to 1 fuel to lubricant ratio | ran consistently cooler than SuperTech under load: cylinder head about 5 F cooler at 2 hrs, 15 F cooler at 3 hrs, 16 F cooler at 4 hrs, 20 F cooler at 4.5 hrs; exhaust gas about 10 F cooler from 2 to 4.5 hrs | evaporated much more quickly than SuperTech in the evaporation test, but left more visible residue behind in the crucible | left slightly more deposit on the spark plug and slightly more carbon buildup on the cylinder head and piston than SuperTech in the generator engine test | not tested |
| 2SuperTech Universal 2-Cycle Engine Oilaround $3 per quart | wear scar 17 percent larger than AMSOIL's | quite a bit of rust formed on the coated bolt, did not do a good job blocking corrosion | took about 1 minute 15 seconds longer than AMSOIL to ignite in the simple flame test, indicating a higher flashpoint | 330 degrees Fahrenheit per independent lab analysis (higher than AMSOIL's 225 F) | 300 to 475 parts per million, notably higher (less clean burn) than AMSOIL's 15 to 108 ppm | cylinder head nearly spotless with some buildup near the valves; had quite a bit more carbon buildup on the intake valve and between the valves than AMSOIL | initial compression test read 89 psi; a later passage says the generator engine started out at 88 psi (single-digit discrepancy in the transcript, not resolved) and rose to 90 psi after 4.5 hours of load testing | used as the baseline; ran hotter than the AMSOIL engine under load by the margins noted in AMSOIL's entry | evaporated more slowly than AMSOIL and left less visible residue behind in the crucible | had a little less carbon buildup on spark plug, cylinder head, and piston than AMSOIL in the generator engine test; lab noted SuperTech contains a small amount of calcium (a detergent dispersant) which may explain this | no American Petroleum Institute donut on the container, unlike a certified oil |
How it was tested
- lubricity / bearing wear scar test
- corrosion resistance (coated bolt rust test)
- flashpoint (simple flame ignition test)
- flashpoint (independent lab analysis)
- combustible gas / unburned hydrocarbons in exhaust (first small engine)
- carbon deposit buildup on spark plug, cylinder head, valves (first small engine)
- engine compression before and after load testing
- cylinder head and exhaust gas temperature under sustained generator load
- oil evaporation and residue
- carbon deposit buildup (second generator engine, after load test)
- independent oil lab chemistry analysis
“super tech not being a synthetic oil was definitely at a disadvantage and that really started to show we did several the test whether its corrosion resistance film strength as far as the engine temperature during the generator run am ZOL had a huge advantage”