Get precise oil amount for 40:1 string-trimmer fuel mixing and avoid engine wear.
Quick Reference
Gallons
Liters
Fuel (Gallons)
Oil (fl oz)
1 gallon
3.2 fl oz
2 gallons
6.4 fl oz
2.5 gallons
8 fl oz
3 gallons
9.6 fl oz
5 gallons
16 fl oz
10 gallons
32 fl oz
Also see
50:1
32:1
25:1
24:1
20:1
16:1
100:1
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Facts About 40:1
⛽
PER GALLON
3.2 fl oz
🧪
PER LITER
25 mL
📐
OIL PERCENTAGE
2.4%
Equipment Rated for 40:1
This equipment uses a 40:1 mix ratio. Always check your owner's manual to confirm.
Ryobi
Poulan
Craftsman
Weed Eater
Troy-Bilt
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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.