Poulan 306A Fuel Mix Ratio (Fuel Ratio Chart)
The Poulan 306A is commonly listed for a 16:1 gasoline-to-two-stroke-oil mix: add 8 US fluid ounces (237 mL) of oil to 1 US gallon (3.785 L) of gasoline. Confirm this specification in the saw’s manual or model-specific service information before use. Do not guess at a modern 40:1 or 50:1 ratio.
Getting the mix right helps protect the engine and saves money on avoidable repairs. The 306A is a vintage air-cooled, two-stroke chainsaw, and its fuel requirement may differ from newer saws. I treat the ratio as a model-specific specification, not a setting to update by habit.
If you are standing in the shed with an empty fuel can, use the chart below only after confirming 16:1 for your saw. If you cannot confirm the ratio, pause and ask a qualified chainsaw service shop to check the model-specific documentation.
Poulan 306A fuel mix ratio and chart
A fuel mix ratio compares the volume of gasoline with the volume of two-stroke oil. For the 306A, 16:1 is commonly listed, meaning 16 parts gasoline to 1 part oil by volume. Because this is an older saw, confirm the specification for your saw before mixing or running it.
At 16:1, the oil amount is one-sixteenth of the gasoline volume. The table uses US gallons and US fluid ounces; metric amounts are rounded for practical measuring. The ratio describes the gasoline and oil, not the final combined volume.
| Gasoline | Two-stroke oil at 16:1 |
|---|---|
| 1 US quart (0.946 L) | 2 US fl oz (59 mL) |
| ½ US gallon (1.893 L) | 4 US fl oz (118 mL) |
| 1 US gallon (3.785 L) | 8 US fl oz (237 mL) |
| 2 US gallons (7.571 L) | 16 US fl oz (473 mL) |
| 5 US gallons (18.927 L) | 40 US fl oz (1.183 L) |
| 1 L gasoline | 62.5 mL |
Measure gasoline first, then add the matching oil amount. Do not use the table to override a manual or reliable service information for your model and serial number. If documentation gives a different ratio, verify that it applies to your exact saw before proceeding.
Confirm the ratio before mixing
Model-specific documentation is the safest way to settle a fuel-ratio question. A model name alone may not identify every manual revision or service instruction. Check the original manual or documentation tied to the saw’s identification, and ask a qualified shop to verify it if the information is missing or unclear.
Look for the model and serial information on the saw, then compare it with the manual or service documentation. Do not assume a newer Poulan’s 40:1 or 50:1 recommendation applies to a 306A.
If the saw has old fuel in it and you do not know the ratio, do not start it to “see how it runs.” A leaner-than-specified mix can reduce engine lubrication and risk piston or cylinder damage. Too much oil can contribute to smoke, deposits, and poor running. Confirm the correct specification first.
Equipment setup and safe fuel preparation
Safe preparation means checking the saw and mixing fuel before starting, with the engine off and cool. Use fresh gasoline and air-cooled two-stroke oil that is suitable for the documented ratio. Mix in an approved fuel container, and keep fuel away from heat, sparks, flames, and other ignition sources.
I use a simple sequence to avoid a rushed measuring mistake:
- Check the manual or model-specific service information for the required ratio.
- Choose how much gasoline you need and measure it in an approved fuel container.
- Measure the matching oil amount from the chart with a marked measuring cup or bottle.
- Add both liquids to the container and close it securely.
- Mix the contents thoroughly before filling the saw.
Use oil made for air-cooled two-stroke engines and follow its label as well as the saw’s documented requirement. Do not substitute an oil intended for a different type of engine unless its manufacturer states that it is suitable for this application and ratio.
The 306A also needs bar-and-chain oil in its separate oil tank. Fuel mix does not lubricate the chain. Keep the two fluids in their correct tanks, and do not use fuel mix or used motor oil as bar oil.
Mixing scenarios and common mistakes
These examples show how the same 16:1 calculation works at different batch sizes. They are mixing scenarios, not alternate specifications. Choose a batch you can measure accurately and use in line with the manual and fuel-oil labels; do not stretch a small amount of oil across a larger volume of gasoline.
A common garage mix is 1 US gallon of gasoline with 8 US fluid ounces of oil. If you need only half a gallon, the matching amount is 4 fluid ounces. For 1 liter of gasoline, use 62.5 milliliters of oil. Measuring the oil to match the gasoline is more reliable than estimating by eye.
| Situation | Correct action |
|---|---|
| You have 1 gallon of gasoline | Add 8 fl oz (237 mL) of suitable two-stroke oil, if 16:1 is confirmed |
| You have half a gallon | Add 4 fl oz (118 mL), if 16:1 is confirmed |
| You have 1 liter | Add 62.5 mL, if 16:1 is confirmed |
| You cannot confirm the saw’s ratio | Do not run it; check documentation or ask a qualified shop |
| You already mixed at 40:1 or 50:1 | Do not treat it as correct for the 306A; verify the specification before use |
| The oil tank is empty | Fill it with dedicated bar-and-chain oil, not fuel mix |
A frequent error is confusing “more modern” with “correct for an older saw.” Another is measuring oil against the final combined liquid volume rather than the gasoline volume. At 16:1, calculate the oil from the amount of gasoline.
Starting and checking the saw
Correct fuel is only one part of a safe start. Before using the saw, check its controls, chain, bar, and oil supply, then follow the starting procedure in the manual. Do not try to correct a suspected fuel-ratio problem by adjusting the carburetor or running the engine under load.
With the engine cool and off, check the chain brake, throttle lockout, chain catcher, fasteners, bar, chain tension, and bar-and-chain oil supply. Use a bar length approved for the saw, and make sure the chain matches the bar and sprocket. Do not infer chain pitch, gauge, or drive-link count from the model name alone.
Start the saw as described in its manual, on stable ground with the chain brake engaged. Before cutting, check for safe idle behavior and confirm that the chain receives oil. If the chain moves at idle, the saw runs poorly, or you suspect the fuel is wrong, stop and have the cause checked. Do not compensate with an unverified carburetor adjustment.
Wear appropriate chainsaw protective equipment, including leg protection, head and face or eye protection, hearing protection, gloves, and suitable boots. Check footing, escape routes, overhead hazards, and bystanders before cutting. Keep two hands on the saw and avoid the bar nose, where contact can cause kickback.
Maintenance, sharpening, and carburetor service
Routine care helps you spot fuel-related trouble without confusing it with a dull chain or lubrication fault. Keep the fuel specification, chain condition, and carburetor service separate in your diagnosis. Use model-specific instructions for adjustments; there is no universal carburetor setting or RPM figure that should replace service data.
A dull or damaged chain can make cutting harder, but it does not change the required fuel ratio. Do not lean on the saw to force a dull chain through wood. Sharpen and tension the chain according to its markings and the manufacturer’s instructions.
If the saw smokes heavily or runs poorly, those symptoms alone do not prove the mix is wrong. Check what went into the fuel container and confirm the ratio first. If the mixture is correct but the saw still has a problem, use the model-specific service information or consult a qualified technician. Incorrect mixture-screw changes can cause lean running and engine damage.
After use, stop the engine and let it cool before cleaning or refueling. Clean the bar groove and oil passages, inspect the chain and tension, and address damage before the next use. Fill the separate bar-oil tank with suitable bar-and-chain oil.
Storage and seasonal care
Storage care starts with the fuel and oil instructions supplied for the saw and the products used. Do not rely on an assumed storage period or fuel-treatment method. Follow the manual and product labels, and keep fuel in an approved, closed container away from ignition sources.
Before putting the saw away, check the fuel ratio and label any mixed fuel clearly so it is not mistaken for straight gasoline or another mixture. Keep the fuel container closed and stored safely. For seasonal storage, follow the manual’s instructions for fuel handling and preparation.
Before the next use, inspect the saw, verify the mixture again, and check the separate chain-oil supply. If you cannot establish what is in an old container, do not guess or run the saw on it. Confirm the fuel specification and prepare a correctly measured batch.
The practical rule is simple: verify the 306A’s documented ratio, measure accurately, and keep chain oil separate. If the ratio is uncertain, wait rather than test it in the engine.
Frequently asked questions
These short answers cover the fuel decisions owners most often need to make before starting a 306A. When an answer depends on a particular saw’s manual or service record, verify that information rather than applying a general rule to every saw with the same model name.
What fuel mix does a Poulan 306A commonly use?
It is commonly listed as 16:1 gasoline to two-stroke oil. Confirm the ratio in the manual or model-specific service information before use.
How much oil goes in one gallon of gasoline?
At 16:1, add 8 US fluid ounces (237 mL) of suitable air-cooled two-stroke oil to 1 US gallon (3.785 L) of gasoline.
How much oil do I add to half a gallon?
At 16:1, add 4 US fluid ounces (118 mL) of oil to half a US gallon of gasoline.
How much oil do I add to one liter of gasoline?
At 16:1, add 62.5 mL of oil to 1 liter of gasoline.
Can I use a 40:1 or 50:1 mix?
Do not assume either modern ratio is correct for the 306A. Use it only if reliable documentation for your exact saw specifies it.
What if I cannot find the manual?
Do not guess or start the saw. Ask a qualified chainsaw service shop to verify the fuel specification from model-specific documentation.
Does the fuel mix lubricate the chain?
No. The saw needs dedicated bar-and-chain oil in a separate tank.
Can I use the saw’s carburetor adjustment to fix the wrong mix?
No. First verify and correct the fuel specification. Use model-specific service data for carburetor work.
What if I already mixed fuel at the wrong ratio?
Do not run the saw on it. Confirm the correct specification and prepare the fuel accordingly before starting.
Can I tell the fuel ratio by smoke or how the saw runs?
Not reliably. Smoke or poor running does not confirm the ratio. Check the measurements and documentation, then seek service help if the problem remains.
(This article was written by one of our staff writers, David Hensley. Visit our Meet the Team page.)
