The 20:1 ratio delivers rich lubrication for vintage 2-stroke engines and break-in periods. Common in older outboards and legacy equipment. Mix 6.4 fl oz per gallon.
Quick Reference
Gallons
Liters
Fuel (Gallons)
Oil (fl oz)
1 gallon
6.4 fl oz
2 gallons
12.8 fl oz
2.5 gallons
16 fl oz
3 gallons
19.2 fl oz
5 gallons
32 fl oz
10 gallons
64 fl oz
Also see
50:1
40:1
32:1
25:1
24:1
16:1
100:1
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Facts About 20:1
⛽
PER GALLON
6.4 fl oz
🧪
PER LITER
50 mL
📐
OIL PERCENTAGE
4.8%
Equipment Rated for 20:1
This equipment uses a 20:1 mix ratio. Always check your owner's manual to confirm.
Vintage Lawn-Boy
Classic outboards
Break-in engines
Older 2-stroke
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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.