The 50:1 ratio is the most common 2-stroke fuel mix. Used by STIHL, Husqvarna, ECHO, and most modern outdoor power equipment. Mix 2.56 fl oz of oil per gallon of fuel.
Quick Reference
Gallons
Liters
Fuel (Gallons)
Oil (fl oz)
1 gallon
2.56 fl oz
2 gallons
5.12 fl oz
2.5 gallons
6.4 fl oz
3 gallons
7.68 fl oz
5 gallons
12.8 fl oz
10 gallons
25.6 fl oz
Also see
40:1
32:1
25:1
24:1
20:1
16:1
100:1
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Facts About 50:1
⛽
PER GALLON
2.56 fl oz
🧪
PER LITER
20 mL
📐
OIL PERCENTAGE
2.0%
Equipment Rated for 50:1
This equipment uses a 50:1 mix ratio. Always check your owner's manual to confirm.
STIHL
Husqvarna
ECHO
Yamaha 2-stroke outboards
Mercury 2-stroke outboards
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⚠️
Ethanol Hazard
Use E0 when available, or E10 if your manual allows it. Higher-ethanol blends absorb water faster, age poorly, and can damage small-engine fuel systems.
Ready to Mix?
Use the calculator to get exact fuel and oil amounts.