Why are There Different Chainsaw Oil Mix Ratios?

Most manufacturers recommend a 50:1 chainsaw oil mix ratio, but some call for 40:1 and even 32:1 in older saws....

August 30, 2021

Most 2-stroke chainsaws recommend a 50:1 chainsaw oil mix ratio. But some recommend 40:1. Older two-stroke equipment might even call for 32:1. Untangling the different recommendations and mixing multiple containers of fuel is a hassle, particularly for professional landscapers who run several different pieces of equipment. In this post, we’ll explain chainsaw oil mix ratios, offer a solution to mixing multiple fuel cans and take a look at what we think is the best 2-stroke oil for your chainsaw.

Chainsaw oil mix ratios explained

Say your chainsaw manufacturer recommends a 50:1 fuel/oil mix. This simply means you need 50 parts of gas to one part two-stroke oil.

To mix one gallon of fuel at 50:1, add 2.6 ounces of two-stroke oil to one gallon of gas, as the top chart shows. The bottom chart shows the same ratios in metric figures.

2-stroke mix chart
Metric 2-Stroke Mix Ratio

Two-stroke engines derive lubrication from the oil mixed directly into the gasoline, unlike your car engine, which lubricates itself with oil housed in an oil sump and circulated by an oil pump. Read more about the differences between two- and four-stroke engines here.

Different mix ratios create confusion

Complicating things, some equipment manufacturers recommend different chainsaw oil mix ratios.

While most modern chainsaws and other equipment, like string trimmers and leaf blowers, call for 50:1, some call for 40:1 and even 32:1 in older equipment. If you have multiple pieces of equipment with different mix ratios, you have to mix and store multiple cans of fuel. That’s not only a hassle, it invites misapplication.

This scenario likely isn’t a problem for landscapers, loggers and other professionals who replace their equipment often due to heavy use. But plenty of homeowners still use older equipment that calls for a richer fuel mixture.

Life would be much easier if every manufacturer recommended the same mix ratio, right?

They don’t. But we do.

One two-stroke mix ratio for all equipment

AMSOIL SABER Professional Synthetic 2-Stroke Oil is tested and proven at any mix ratio up to 100:1.

That means you can mix one can of fuel and use it in all your two-stroke equipment. Done. Problem solved. If you want to use 50:1, use that. Or 80:1. For best value, use 100:1.

Check out the video for details.

What’s the best 2-stroke oil for chainsaws?

It should come as no surprise that we think it’s AMSOIL SABER Professional Synthetic 2-Stroke Oil since this is the AMSOIL blog, after all. But we know you want proof, not empty claims.

SABER Professional delivers improved cleanliness mixed at 100:1 compared to other oils mixed at a conventional 50:1 ratio, as the images of the spark-arrestor screens show. The spark-arrestor screen is especially prone to deposits since it’s positioned in the exhaust stream. Heavy deposits choke off airflow and lead to hard starting, rough running and power loss.

Equipment using SABER Professional was 96 percent carbon-free based on spark-arrestor testing.

AMSOIL SABER Professional 2-stroke oil fights carbon

You can also check out this technical study that shows how SABER Professional performed against a competitor’s oil in ECHO string trimmers.

Check out how SABER Professional helps Duluth Lawn Care extend two-stroke equipment life.

SABER Professional solves the problem posed by different mix ratios for your chainsaw, trimmer and other equipment. It provides excellent protection at any mix ratio up to 100:1. As the testing shows, it’s also one of the best two-stroke oils for your chainsaw and other equipment available.

Updated. Originally published June 20, 2017.

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