Stihl 2-Stroke Oil: HP vs HP Super vs HP Ultra, 50:1 Mix
Published July 9, 2026 · 3 min read
If you run a Stihl chainsaw, trimmer, or blower, you have two questions: which Stihl 2-stroke oil to buy (HP, HP Super, or HP Ultra), and how much of it goes in the gas. The second one is easy. Every modern Stihl gasoline tool mixes at 50:1, which is 2.56 oz of oil per US gallon (20 ml per litre). The first one comes down to how you use the machine. This guide covers the whole Stihl 2-cycle oil lineup, the ratio, and what to do when the orange bottle isn’t on the shelf.
The Stihl 2-stroke oil lineup
Stihl sells three tiers of two-stroke engine oil. All three mix at the same 50:1 ratio in Stihl equipment; the difference is the base oil and how cleanly it burns:
| Oil | Base | Best for |
|---|---|---|
| Stihl HP | Mineral | Occasional homeowner use. The standard, budget-friendly choice |
| Stihl HP Super | Semi-synthetic | Regular use. Burns cleaner with less smoke and fewer deposits |
| Stihl HP Ultra | Full synthetic | Frequent or professional use. The cleanest burn, best high-temperature protection, and largely biodegradable |
The rule of thumb: the more hours you put on the saw, the more the synthetic pays for itself. Full synthetic keeps the exhaust ports and spark plug clean over hundreds of tanks. We cover why in synthetic vs conventional 2-stroke oil.
The ratio: 50:1, always
Stihl specifies 50:1 (50 parts gas to 1 part oil) for all of its gasoline-powered tools. Per US gallon of fresh 89+ octane gas, that’s 2.56 fluid ounces of oil; per litre it’s 20 ml. That includes the BR 600 and BR 800 backpack blowers, whose 4-MIX engines are four-strokes that still run on premix; the leaf blower gas oil mix guide explains why straight gas would seize them, and the Stihl weed eater gas mix guide lists every FS trimmer, KM KombiEngine and BG or BR blower by engine type, with tank sizes.
Stihl’s bottle sizes are designed around this: the small 2.6 oz bottle treats one gallon, and the 6.4 oz bottle treats 2.5 gallons. If you’re mixing a different amount, or you found a part-full can in the garage, use the calculator:
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Prefer a printable table? See the 50:1 mix chart or the full ratio charts.
Do you have to use Stihl oil?
No. Stihl equipment needs a quality 2-stroke oil rated for air-cooled engines, mixed at 50:1. The JASO FD standard is the one to look for on the bottle. Stihl’s own oils are formulated (and warrantied) for exactly that, but Husqvarna XP+, Echo Power Blend, and AMSOIL Saber are all safe substitutes in a pinch. Two things you should never substitute:
- Marine TC-W3 outboard oil, which is formulated for water-cooled engines that run much cooler than a chainsaw cylinder.
- Regular motor oil, which isn’t low-ash and will carbon up the exhaust port and foul the plug. More on that in 2-cycle vs 2-stroke.
Mixing itself is the part people get wrong far more often than brand choice: measure the oil, don’t eyeball it. The complete mixing guide walks through it step by step, and the chainsaw page covers saw-specific guidance for Stihl, Husqvarna, and Echo. Comparing brands before you buy? Start with the best 2-stroke oil guide.
Common questions
[01] What is the mix ratio for Stihl 2-stroke oil?
50:1, meaning 50 parts gasoline to 1 part oil. That works out to 2.56 oz of oil per US gallon of gas, or 20 ml per litre. Stihl specifies 50:1 for all of its gasoline-powered tools when using Stihl 2-stroke oil or any comparable high-quality 2-cycle oil.
[02] Are all Stihl 2-stroke engines 50:1?
Yes. Modern Stihl chainsaws, trimmers, and blowers all call for a 50:1 gas-to-oil mix. Check your owner's manual if the machine is decades old, but every current Stihl gasoline tool runs 50:1.
[03] Can I use any 2-stroke oil in my Stihl?
Any high-quality 2-stroke oil rated for air-cooled engines (look for JASO FD on the bottle) mixed at 50:1 is safe in a Stihl. Do not use marine TC-W3 outboard oil or regular 4-stroke motor oil; both are the wrong formulation for a hot-running air-cooled engine.
[04] What is a substitute for Stihl 2-cycle oil?
Husqvarna XP+, Echo Power Blend, and AMSOIL Saber are all quality air-cooled 2-stroke oils that work in Stihl equipment at 50:1. The spec matters more than the brand: match a JASO FD air-cooled oil and mix it correctly.
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