Leaf Blower Gas Oil Mix: Stihl, Echo, Husqvarna Ratios
Published September 28, 2026 · 6 min read
The gas oil mix for a leaf blower is 50:1 on almost every machine you can buy today: 2.56 oz of 2-stroke oil per US gallon of gas, or 20 ml per litre. Stihl, Echo, Husqvarna, RedMax and the two-stroke Makitas all agree on it, for handheld and backpack units alike. The exceptions are few but expensive: blowers that take straight gas and must never get oil in the tank, blowers that look like four-strokes but must get oil in the tank, and older budget handhelds rated richer. This guide sorts them out, then covers the part that is particular to blowers, which is how much fuel they burn and what that does to your mixing routine.
The ratio by brand
| Brand | Models | Mix | Notes |
|---|---|---|---|
| Stihl | BG 50, BG 56 handhelds; BR 350 backpack | 50:1 | Two-stroke |
| Stihl | BR 600, BR 800 backpacks | 50:1 | 4-MIX engine: four-stroke, but still premix |
| Echo | PB-2520 handheld; PB-580T, PB-770T, PB-9010T backpacks | 50:1 | 89 octane or higher, max 10% ethanol |
| Husqvarna | 125B handheld; 350BT, 570BTS backpacks | 50:1 | X-Torq two-stroke |
| RedMax | Handheld and backpack two-strokes | 50:1 | Strato-charged two-stroke |
| Makita | Two-stroke models | 50:1 | The MM4 four-stroke backpacks take straight gas |
| Poulan, Craftsman, Homelite | Older budget handhelds | 40:1 on many | Read the fuel cap; the rating varies by model and year |
If you searched for one of these brands specifically, the brand oil guides go deeper on which bottle to buy: Stihl, Echo and Husqvarna. All three brands make their oils for exactly this ratio, and any JASO FD rated air-cooled oil is a safe substitute across all of them.
The 4-MIX trap, and the true four-strokes
This is where blower owners get caught, because the word “four-stroke” means two opposite things depending on who made the engine.
Stihl 4-MIX engines, used in the BR 600 and BR 800, have valves and a four-stroke cycle, but no oil sump. Their lubrication comes entirely from the fuel, so they take 50:1 premix like any Stihl two-stroke. Run straight gas through a 4-MIX and it has no lubrication at all; it will seize, and quickly at blower throttle settings. The same engine powers Stihl’s FS 91, FS 111 and FS 131 trimmers; the Stihl weed eater gas mix guide lists every Stihl trimmer and blower by engine type.
True four-stroke blowers, such as the Makita MM4 backpacks and handhelds built around Honda’s mini four-stroke engines, have their own crankcase oil. They take straight unmixed gasoline, and putting premix in them fouls the plug and carbons the valves.
The quick test takes ten seconds: look for an oil fill cap or dipstick on the engine itself. If there is one, the fuel tank gets straight gas. If there is not, the fuel tank gets premix, whatever the marketing on the side says. If you are still unsure what separates the two engine types, 2-cycle vs 2-stroke walks through it.
Blowers burn fuel faster than anything else in the shed
A chainsaw cuts in bursts and a trimmer is throttled up and down constantly. A blower sits at full throttle for as long as you are holding it, which has two consequences for mixing.
The first is volume. Echo’s PB-580T backpack carries a 62 fl oz fuel tank, nearly five times the 12.8 oz tank on an Echo SRM-225 trimmer, and Stihl’s BR 600 holds about 1.4 litres. A single tank on a big backpack holds roughly an ounce and a quarter of oil at 50:1, and a long afternoon of fall cleanup can go through more than one. That changes which can size makes sense:
| Fuel | Oil at 50:1 | Oil at 40:1 |
|---|---|---|
| 1 US gallon | 2.56 oz | 3.2 oz |
| 2.5 US gallons | 6.4 oz | 8 oz |
| 5 US gallons | 12.8 oz | 16 oz |
| 5 litres | 100 ml | 125 ml |
A homeowner with a handheld blower and a trimmer is best served by a one-gallon can mixed fresh each month. Someone running a backpack every weekend in the fall will empty a 2.5 gallon can before it has time to go stale, and a landscaping crew mixes by the five-gallon can. Whatever the size, mix what you will burn in about a month.
The second consequence is heat. Sustained full throttle keeps the piston at peak temperature for minutes at a time, which is exactly where an under-oiled mix does damage fastest. The classic blower failure is a machine that loses air volume steadily through a long job and then seizes. Blowers are the tool you should never guess the ratio on, and the one where a quality JASO FD oil earns its price over the cheapest bottle. The best 2-stroke oil guide compares the options.
For any amount of fuel that is not on the table, the calculator below is preset to 50:1:
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Should you run a blower richer for safety?
A little extra oil is the safer mistake, but it is not free on a modern blower. Most current backpacks use stratified scavenging (Stihl, RedMax and Husqvarna each have their own name for it) to meet emissions rules, and they are tuned around 50:1. Running one at 32:1 “to be safe” leaves carbon on the muffler’s spark arrestor screen and the exhaust port, and a clogged screen costs you power. Use 50:1 unless the decal says otherwise, and use 40:1 only on the older handhelds rated for it. The 40:1 page has the full table for those.
One can for the whole shed
Because Stihl, Echo and Husqvarna rate their blowers, trimmers and chainsaws at the same 50:1, most people can run one can of mix for every two-stroke they own. The Echo weed eater ratio guide covers the trimmer side of that shed, and the string trimmer page covers the brands where it does not hold. Label the can with the ratio and the date you mixed it, and keep it out of the sun.
Blowers are also the most seasonal tool most people own. They work hard for six weeks in the fall and then sit, often with a tank of ethanol-blended fuel in them, until the next year. Either run the tank dry before storage or fill it with ethanol-free canned premix such as Stihl MotoMix or Echo Red Armor, and read spring startup for 2-stroke lawn equipment before the first pull next season. The day-to-day detail for blowers, including the air filter problem backpacks create for themselves, is on the leaf blower mix page.
Common questions
[01] What is the gas oil mix for a leaf blower?
Nearly every gas leaf blower from Stihl, Echo, Husqvarna, Makita two-stroke models and RedMax runs 50:1, which is 2.56 fl oz of 2-stroke oil per US gallon of gas, or 20 ml per litre. Some older and budget handheld blowers from brands like Poulan, Craftsman and Homelite were rated 40:1, so read the fuel cap before you mix.
[02] What is the gas oil mix for a Stihl leaf blower?
50:1 for the whole current Stihl gas blower range, including the handheld BG 50 and BG 56 and the backpack BR 350, BR 600 and BR 800. The BR 600 and BR 800 use Stihl's 4-MIX engine, which is a four-stroke design but is still lubricated by the premix, so it takes the same 50:1 mix as any Stihl two-stroke.
[03] What is the oil ratio for an Echo leaf blower?
50:1. That covers Echo's handheld blowers such as the PB-2520 and the backpack range from the PB-580T up to the PB-9010T. Echo specifies 89 octane or higher gas with no more than 10 percent ethanol.
[04] Do backpack blowers use a different mix than handheld blowers?
No. A backpack engine is larger and burns more fuel, but the ratio does not change with engine size. A 58 cc backpack and a 25 cc handheld from the same maker both run 50:1; the backpack simply goes through the can several times faster.
[05] Which leaf blowers take straight gas with no oil?
True four-stroke blowers with their own crankcase oil, such as the Makita MM4 backpack models and Honda-engined handhelds, take unmixed gasoline, and you check their engine oil on a dipstick or fill plug. Stihl 4-MIX blowers are the exception that catches people out: they are four-stroke but have no oil sump, so they must run on 50:1 premix.
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