What is the mix ratio for AMSOIL 2-stroke oil?

It depends on the product. AMSOIL Saber Professional is formulated for any pre-mix ratio from 50:1 up to 100:1 in air-cooled handheld equipment. At 100:1 that is 1.28 oz of oil per US gallon (10 ml per litre); at 50:1 it is 2.56 oz per gallon (20 ml per litre). Dominator racing oil and HP Marine follow whatever ratio your engine builder or outboard manual specifies.

Can you really run AMSOIL Saber at 100:1?

AMSOIL backs Saber Professional at 100:1 in handheld equipment and has marketed it that lean for decades. The catch: nearly every chainsaw and trimmer manual still specifies 50:1, so running 100:1 means relying on AMSOIL's guarantee rather than the tool maker's recommendation. If that tradeoff bothers you, mix Saber at 50:1; it burns very clean at any ratio in its range.

Is Red Armor better than AMSOIL Saber?

Neither is universally better. Echo Red Armor is a JASO FD oil with a strong carbon-cleaning detergent package, built for Echo's 50:1 ratio. AMSOIL Saber is a full synthetic designed to run any ratio up to 100:1. In an Echo tool mixed at 50:1 both perform well; Saber is the more versatile bottle if you run several machines at different ratios.

Can I use AMSOIL 2-stroke oil in Stihl or Husqvarna equipment?

Yes. Saber Professional is a low-ash full synthetic made for air-cooled 2-stroke engines, so it works in Stihl, Husqvarna, and Echo tools. The conservative play is to mix it at the ratio the equipment manual specifies (50:1 for those brands) rather than at AMSOIL's 100:1.

AMSOIL 2-Stroke Oil: Saber Professional and the 100:1 Ratio Question

AMSOIL 2-stroke oil is famous for one number: 100:1. Saber Professional, the company’s flagship 2-cycle oil, is marketed to run as lean as 100 parts gas to 1 part oil, twice as lean as the 50:1 your chainsaw manual calls for. That claim is either the best reason to buy AMSOIL or the best reason to be suspicious of it, depending on who you ask. This guide covers the AMSOIL two-stroke lineup, what 100:1 actually means in ounces and millilitres, and an honest look at whether you should run it that lean.

The AMSOIL 2-stroke oil lineup

AMSOIL sells several 2-stroke oils, and they are not interchangeable. Match the product to the engine type:

Oil	Type	Best for
Saber Professional	Full synthetic, pre-mix	Air-cooled handheld equipment: chainsaws, trimmers, blowers. Any ratio up to 100:1
Dominator	Full synthetic, racing	Dirt bikes, karts, and high-rpm engines mixed rich per the builder’s spec
HP Marine	Synthetic TC-W3	Water-cooled outboards. A different spec entirely; never swap it into a chainsaw

Saber is the one most people mean when they search for AMSOIL 2-cycle oil, and it is the one this guide focuses on. It is a low-ash full synthetic for hot-running air-cooled engines; the base-oil story behind that is covered in synthetic vs conventional 2-stroke oil.

The 100:1 question, honestly

Here is the tension. AMSOIL states that Saber Professional protects at 100:1 in handheld equipment and backs that use. Meanwhile, Stihl, Husqvarna, and Echo all specify 50:1 in their manuals, full stop. Both positions are real, so it helps to see the actual difference in oil:

50:1 is 2.56 oz per US gallon (20 ml per litre). See the 50:1 chart.
100:1 is 1.28 oz per US gallon (10 ml per litre). See the 100:1 chart.

The case for 100:1: modern full synthetics lubricate far better per ounce than the mineral oils those 50:1 specs were written around, so a good synthetic at 100:1 can still coat what needs coating while burning cleaner, smoking less, and fouling fewer plugs. One lean mix for every machine you own is also genuinely convenient, and each bottle treats twice the gas.

The case against: at 100:1 there is no margin for error. A sloppy pour, an oversized “gallon” jug, or topping the can off with straight gas leaves you leaner than 100:1, and lean is what scores pistons. You are also stepping outside the equipment maker’s spec: if a saw fails under warranty and the dealer finds a 100:1 mix, you will be arguing AMSOIL’s guarantee against the manufacturer’s manual. Nothing about Saber requires the lean ratio; it runs superbly at 50:1 too.

Our take matches the site’s general rule: the manual wins. Run Saber at 50:1 and you get a top-tier synthetic with zero warranty argument. If you do choose 100:1, measure precisely (a syringe or ratio cup, not a glug), mix fresh, and use it in every tank so leftover 50:1 fuel never dilutes your math the wrong way.

Measure it, whatever ratio you pick

At these lean ratios the difference between right and wrong is fractions of an ounce, so calculate rather than estimate. The calculator below is preset to 50:1; type 100 in the ratio box for AMSOIL’s lean spec, and it converts both ways for gallons and litres:

Fuel → oil Oil → fuel

Amount of fuel

Equipment (optional)

Mix ratio

Custom ratio (X : 1)

Add this much oil

12.8 oz

≈ 378.54 ml

Add 12.8 oz of 2-stroke oil to 5 gal of gas at a 50:1 ratio.

You can also keep the 2-stroke oil mix calculator bookmarked on your phone for the fuel station, or print the 100:1 and 50:1 tables for the shop wall.

Where AMSOIL fits among the other brands

Saber’s real advantage is versatility: one full-synthetic pre-mix oil that is safe in every air-cooled two-stroke you own, whatever ratio each manual specifies. If you only run one brand of equipment, the house oils (Stihl HP Ultra, Husqvarna XP+, Echo Red Armor) are excellent and keep the warranty conversation simple. If your shed holds a Stihl saw, an Echo trimmer, and an old 40:1 blower, one bottle of Saber mixed per each manual covers all of them. For the wider comparison, including marine and racing picks, see the best 2-stroke oil guide, and for technique, the step-by-step mixing guide shows how to measure a premix properly.