2-Stroke Fuel Mixing Guide

1 Select the Right Container

Container requirements for safe and effective mixing:

• Approved fuel containers only: Use containers specifically rated for gasoline (usually red for gas)
• Clear or translucent: Allows you to see fuel level and check for separation
• Proper venting: Self-venting spout or separate vent prevents pressure buildup
• Tight seal: Prevents evaporation and contamination
• Size appropriate: 1-gallon, 2.5-gallon, or 5-gallon based on your needs
• Clean and dry: No water, dirt, or residue from previous use

2 Calculate Oil Amount

Use our calculator for precision:

Visit our 2-stroke mix calculator and enter:

• Fuel quantity (gallons or liters)
• Desired ratio (50:1, 40:1, etc. - check your equipment manual)
• Oil density if known (optional for maximum accuracy)

The calculator provides measurements in fluid ounces, milliliters, and liters. Write down this number before proceeding.

3 Add Oil First

Critical: Always add oil before gasoline

Why this order matters:

• Better mixing: Gasoline agitates and mixes oil as it's poured
• Prevents separation: Oil at bottom gets immediately blended
• More accurate: Easier to measure oil into empty container
• Safety: Less risk of spills when measuring oil without gas present

Measuring technique:

1. Use a clean measuring cup or graduated cylinder
2. Pour oil slowly to the exact measurement line
3. Check at eye level for accuracy
4. Pour measured oil into your fuel container
5. Rinse measuring cup with a small amount of gas (optional)

4 Add Gasoline

Use fresh, quality gasoline

Gasoline requirements:

• Octane rating: Minimum 87 octane (regular unleaded). High-performance engines may require 89+ octane
• Ethanol content: Ethanol-free preferred. If using E10 (10% ethanol), use fuel within 30 days
• Freshness: Purchase from high-volume gas station (higher turnover = fresher fuel)
• No contamination: Avoid gas with water, dirt, or debris

Pouring procedure:

1. Pour gasoline into container with oil already present
2. Fill to your desired fuel quantity
3. Use fuel pump nozzle slowly or pour carefully from approved container
4. Leave some air space at top (1-2 inches) for expansion and shaking

5 Shake Thoroughly

Most overlooked but critical step

Proper shaking technique:

1. Seal container tightly: Ensure cap is screwed on firmly and vent is closed
2. Shake vigorously: Use both hands, shake with circular motion for 30-60 seconds minimum
3. Check for mixing: If container is translucent, look for color uniformity
4. Let settle briefly: Allow 10 seconds for air bubbles to escape
5. Shake again: Give it another 15-30 second shake before first use

Why thorough mixing is essential:

• Oil and gasoline have different densities - they want to separate
• Inadequate mixing creates pockets of pure gas (no lubrication = engine damage)
• First fuel pulled into engine may be pure gas if not mixed properly
• Modern synthetic oils mix easier than old mineral oils, but still require agitation