Water cooled and air cooled 2-stroke oil should NEVER be used interchangably.
http://store.chainsawr.com/
yes
50:1 with the appropriate two cycle oil.
from my experience with engines mostly small engines such as a chainsaw or a 90cc quad takes 2-cycle oil
If the engine is a 2 cycle engine it has no crankcase and therefore there is no way to change the oil as it is mixed with the fuel.
Use regular Stihl 2 cycle oil. You mix it 50:1.
No one is not a viable substitute for the other.
No - 2 cycle oil is the only oil you should use in a 2 cycle motor. Because 2 cycle oil is designed to mix with the gas and lube the motor. Your "truck oil" is not the 4 cycle oil will not mix it is designed to just lube in the crank case.
For 2-cycle oil it is 40:1 and for 30 weight auto oil it is 25:1
It would be blue if it's got 2 cycle oil in it like for a weed eater or chainsaw
The mix ratio is 50:1, but be sure to use a good 2 cycle oil such as Husqvarna's or Echo's. Do use a motor boat or motorcycle 2 cycle oil. Those are not rated for the small engines like used in the 141 chainsaw. Best bet is to buy the oil at a reliable mower shop.
Oil for 4 cycle engines are given a rating that is a two letter code beginning with an "S" and followed by another letter that is a code for the additive package in the oil. I would not consider anything below an SF rating and would suggest an SH rating as a minimum. It may have a C raitng as well which applies to diesel engines. Generally an oil for 4 cycle engines is just that and is suited for all engines regardless of the application if the additives are correct.
If it is a 2 cycle where you mix the oil with the gasoline then use 2 cycle marine oil. If it is a 4 cycle then use the weight recommended by Evinrude.