Fuel mix calculator
Two-Stroke Oil Mix Calculator
Enter your fuel-to-oil ratio and the amount of fuel to see exactly how much two-stroke oil to add. Works for chainsaws, trimmers, leaf blowers, mopeds, dirt bikes and outboard motors.
Two-stroke mix chart
Millilitres of oil to add for common fuel amounts and ratios. Always use the ratio in your equipment manual.
| Fuel | 25:1 | 32:1 | 40:1 | 50:1 | 100:1 |
|---|---|---|---|---|---|
| 1 L | 40 ml | 31.3 ml | 25 ml | 20 ml | 10 ml |
| 2 L | 80 ml | 62.5 ml | 50 ml | 40 ml | 20 ml |
| 5 L | 200 ml | 156.3 ml | 125 ml | 100 ml | 50 ml |
| 10 L | 400 ml | 312.5 ml | 250 ml | 200 ml | 100 ml |
| 20 L | 800 ml | 625 ml | 500 ml | 400 ml | 200 ml |
Two-stroke oils
Fully synthetic AMSOIL two-stroke oils for premix engines. Pick up in Riga or get delivery across the Baltics.
Other oils
AMSOIL Saber® Professional 100% Synthetic 2-Stroke Oil
Excellent lubricity and cleanliness Controls friction and helps prevent wear, plug fouling, ring sticking and exhaust-port blocking Smokeless – delivers fewer emissions at 100:1 Stabilizes fuel during storage Delivers outstanding protectio…
€1.89
In stock
Motorcycle
AMSOIL Dominator® 100% Synthetic 2-Stroke Racing Oil
Race-proven, anti-friction chemistry provides an extra measure of protection against piston scuffing and bearing wear. Superior film strength provides protection in engines that can exceed 10,000 rpm. Burns clean; helps prevent ring sticki…
€71.60
In stock
Frequently asked questions
What does a 50:1 mix ratio mean?
It means 50 parts fuel to 1 part oil. For every litre (1,000 ml) of fuel you add 20 ml of two-stroke oil, so a 5-litre can needs 100 ml.
How do I mix two-stroke fuel correctly?
Use a clean, approved fuel can. Pour in about half of the fuel, add the full amount of oil, close the can and shake it, then add the remaining fuel and shake again. Mix small batches that you will use up quickly.
What happens if I use the wrong ratio?
Too little oil can leave the piston and bearings without enough lubrication, which risks scoring or seizure. Too much oil can cause smoke, fouled spark plugs and carbon deposits. Always follow the ratio your equipment manufacturer specifies.
Can I run a 100:1 mix?
Only if both the engine manufacturer and the oil allow it. Some oils, such as AMSOIL SABER Professional, are formulated for ratios up to 100:1, but keep to the manufacturer’s ratio, especially while the equipment is under warranty.
How long does mixed fuel keep?
Mixed fuel is best used within about a month. Store it in a sealed can away from heat and sunlight, and add a fuel stabiliser if it has to last longer, such as over winter.
Do I need to premix if my engine has oil injection?
No. Oil-injected two-stroke engines meter oil automatically from a separate tank, so you fill up with plain fuel and top up the oil tank instead. This calculator is only for premix engines.