1. What is the Gas Oil Ratio?

The gas oil ratio is the proportion of gasoline to oil needed for two-stroke engines like chainsaws. Stihl chainsaws typically use a 50:1 ratio (50 parts gas to 1 part oil) for most models.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( Gas \) — Amount of gasoline in gallons
• \( Ratio \) — Mix ratio (e.g., 50 for 50:1)
• 128 — Conversion factor (ounces per gallon)

Explanation: The formula converts gallons to ounces and divides by the ratio to determine the proper oil amount.

3. Importance of Proper Mixing

Details: Using the correct gas-oil mixture is crucial for engine lubrication and performance. Too little oil can cause engine damage, while too much can cause poor performance and excess smoke.

4. Using the Calculator

Tips: Enter the amount of gasoline you want to mix and your desired ratio (typically 50:1 for Stihl chainsaws). The calculator will determine how many ounces of oil to add.

5. Frequently Asked Questions (FAQ)

Q1: What ratio should I use for my Stihl chainsaw?
A: Most modern Stihl chainsaws use a 50:1 ratio. Check your owner's manual for specific recommendations.

Q2: Can I use the same ratio for all two-stroke engines?
A: No, different equipment may require different ratios. Always check manufacturer specifications.

Q3: What happens if I use the wrong mix ratio?
A: Too little oil can cause engine seizure, while too much oil can cause spark plug fouling and excess smoke.

Q4: Should I use synthetic or conventional two-stroke oil?
A: Stihl recommends their own brand of synthetic oil, but any high-quality two-stroke oil meeting ISO-L-EGD and JASO M345 FD standards is acceptable.

Q5: How should I store mixed fuel?
A: Store in an approved container for no more than 30 days, as the mixture can degrade over time.