Home How Much Oil for 2.5 Gallons at 25:1?

How Much Oil for 2.5 Gallons at 25:1?

You Need:
12.8 fl oz
(379 mL or 0.379 liters)
of 2-stroke oil for 2.5 gallons of gasoline at 25:1 ratio

How to Mix 2.5 Gallons at 25:1

  1. Pour 2.5 gallons of fresh gasoline into a clean, approved fuel container
  2. Measure 12.8 fl oz (379 mL) of high-quality 2-stroke oil
  3. Add the oil to the gasoline (not gasoline to oil)
  4. Cap the container and shake vigorously for 30 seconds to mix thoroughly
  5. Label the container with the mix ratio and date
  6. Use within 30 days for best performance

25:1 Mixing Chart

Quick reference for other amounts at 25:1 ratio:

Gallons Oil (fl oz) Oil (mL) Oil (Liters)
1 5.1 fl oz 151 mL 0.151 L
2 10.2 fl oz 303 mL 0.303 L
2.5 (current) 12.8 fl oz 379 mL 0.379 L
3 15.4 fl oz 454 mL 0.454 L
4 20.5 fl oz 606 mL 0.606 L
5 25.6 fl oz 757 mL 0.757 L
6 30.7 fl oz 908 mL 0.908 L
10 51.2 fl oz 1514 mL 1.514 L

What Equipment Uses 25:1 Ratio?

The 25:1 ratio is used by vintage chainsaws from the 1970s-1980s, during engine break-in periods, and older outboard motors.

→ Complete 25:1 Ratio Guide

Important

Always use the fuel ratio specified in your equipment's owner's manual. Using the wrong ratio can cause engine damage from inadequate lubrication (too lean) or fouled spark plugs and carbon buildup (too rich).

Need a Different Amount or Ratio?

Use our full calculator for custom amounts:

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