2-Cycle Oil Mixing Guide: 50:1, 40:1 and 32:1 Ratios Made Simple

Two-stroke engines in chainsaws, leaf blowers, string trimmers and some snow blowers do not have a separate oil system. The oil is mixed directly into the fuel. Getting the ratio wrong can cause smoke, fouled plugs or serious engine damage.

Check the equipment first

The correct ratio is in the owner's manual and often printed on the equipment. Many modern engines use 50:1, while older equipment may use 40:1 or 32:1.

Mixing chart

How to mix it right

1. Use a clean, approved fuel container.
2. Add the 2-cycle oil to the can first.
3. Add fresh gasoline and shake gently to mix.
4. Label the can with the ratio and date.
5. Use mixed fuel within about 30 days, or add a fuel stabilizer.

Use the right oil

Use an oil made for air-cooled 2-cycle engines — not outboard marine oil, unless the equipment maker allows it. Look for a quality rating such as JASO FD or ISO-L-EGD on the bottle.

Do not use 2-cycle mix in 4-stroke equipment

Most lawn mowers and many snow blowers use 4-stroke engines with a separate oil fill. Never put mixed fuel in those engines.

Frequently asked questions

How much 2-cycle oil do I mix with 1 gallon of gas for 50:1?
Use about 2.6 oz of 2-cycle oil per gallon of gasoline for a 50:1 mix. Always confirm the ratio in your equipment's owner's manual.

How long does mixed 2-cycle fuel last?
Use mixed fuel within about 30 days, or add a fuel stabilizer.

Can I put 2-cycle mixed fuel in a lawn mower?
Not in a 4-stroke mower. Most lawn mowers have 4-stroke engines with a separate oil fill and should never get mixed fuel.

2-cycle oil and gas cans we carry

RPS Distributors stocks 2-cycle oil from CAM2 and Super S, plus Midwest Can gas and diesel cans. Browse our Lubricants collection and Auto Accessories collection.

Request a wholesale quote or call 1-855-498-7509.