01
Check the ratio
Read the machine handbook or label before measuring anything.
Practical Rotatech guide
2-Stroke Oil Mixing Guide
Calculate the right amount of oil for your fuel and prepare an accurate mix for smaller garden machines powered by 2-stroke engines.
Quick calculator
How much oil do you need?
Enter your petrol volume and choose the ratio recommended by the manufacturer. The calculator will show how much 2-stroke oil to add.
2-stroke oil to add
100 ml
5 L ÷ 50 = 100 ml
Common measurements
2-stroke fuel mixing chart
Only use the column that matches the ratio stated in your machine handbook.
| Petrol | 50:1 mix | 40:1 mix | 32:1 mix | 25:1 mix |
|---|---|---|---|---|
| 1 L | 20 ml | 25 ml | 31.25 ml | 40 ml |
| 2 L | 40 ml | 50 ml | 62.5 ml | 80 ml |
| 5 L | 100 ml | 125 ml | 156.25 ml | 200 ml |
| 10 L | 200 ml | 250 ml | 312.5 ml | 400 ml |
Simple method
How to prepare the mixture
Always prepare fuel in a clean, approved container, in a well-ventilated area and away from ignition sources.
02
Add the petrol
Pour the required amount of petrol into a clean, fuel-approved container first.
03
Measure the oil
Add the calculated amount of 2-stroke engine oil. Do not estimate the quantity.
04
Seal and mix
Secure the container, shake gently, label the mixture and avoid keeping old mixed fuel.
Suitable equipment
For smaller 2-stroke engines
This guide is suitable for machines whose manufacturer requires a petrol-and-oil premix. Not every machine within a category will use a 2-stroke engine.
Chainsaws
For chainsaws with 2-stroke engines that use premixed fuel.
Strimmers and brushcutters
For 2-stroke models that require petrol and oil to be mixed.
Hedge trimmers and blowers
For compatible handheld garden machines powered by 2-stroke engines.
Some lawnmowers
Only where the lawnmower handbook confirms a premix-fuel 2-stroke engine.
Do not confuse the two
Engine oil and chain oil perform different jobs
2-stroke engine oil
This is mixed with petrol at the specified ratio to lubricate the inside of a 2-stroke engine.
Bar and chain oil
This goes into the chainsaw’s separate oil reservoir to lubricate the guide bar and chain. Do not add it to the fuel.
Everything for your equipment
Oils, mixing equipment and chainsaw parts
Explore the products mentioned in this guide alongside essential replacement parts for your chainsaw.
UK delivery only
Rotatech 2-stroke engine oil
Oil designed to lubricate 2-stroke chainsaw engines with crankcase compression.
View product2-stroke mixing bottle
Clear markings for 25:1, 32:1, 40:1 and 50:1 fuel ratios.
View product
UK delivery only
Chainsaw bar and chain oil
Medium-viscosity mineral oil with anti-fling properties to protect the bar and chain.
View product
UK delivery only
Biodegradable chain oil
Biodegradable lubrication designed to protect chainsaw bars and chains against wear.
View productChainsaw chains
Find compatible replacement chains for thousands of popular makes and models.
Shop the rangeChainsaw guide bars
Explore replacement guide bars for popular chainsaw models.
Shop the rangeMeasure accurately. Mix with confidence.
Use the Rotatech fuel mixing bottle to make preparing common ratios easier.
View the mixing bottle