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40:1 is the fuel mixture per the manual
40:1 40 parts gas to 1 part oil.
The fuel mixture for a 2.0 McCulloch chain saw is 32 to 1. This means that there is 1 part of 2 cycle oil mixed per 32 parts of fuel.
The proper mixture is 40:1 or 3.2 oz oil to 1 US Gallon of gas.
16:1
If using an oil other than McCulloch, the ratio is 40:1. Brand Specific McCulloch two cycle oil is 20:1.
The fuel mix for the mculloch 60012312 is 40:1.
If using an oil other than McCulloch, the ratio is 40:1. Brand Specific McCulloch two cycle oil is 20:1.
50:1 is incorrect. That mixture will not allow enough compression and the unit will be very hard to start, if at all. That mixture works well for Sthil products. If using an oil other than McCulloch, the ratio is 40:1. Brand specific McCulloch two cycle oil is 20:1.
I have model number 60003816 and I run 3oz of oil to 1 galion of gas. Works good but I'm not positive that's what is recommended. The manual for that chainsaw requires a 20:1 mixture of non-McCulloch two-cycle oil. That is 6.4 oz. per gallon of unleaded gasoline regardless of what it says on the oil container.
If using an oil other than McCulloch, the ratio is 40:1. Brand Specific McCulloch two cycle oil is 20:1.
The full ratio according to the embossed diagram on my Mac Cat 435 fuel cap is 40:1. Hope this helps.