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i have never heard of some one putting gear oil in their tank, but a quart of 2-stroke oil works and wont hurt anything cause it is meant to be burned and it is ashless.
I used to throw some in every other tank until i bought some Stanadyne.
Wouldn't run my 02 without 2 stroke in the tank, cheap and no additive I've seen can match it for lubricity. I do add a cold flow improver in the winter.
I have been using the 2 stroke for close to a year now and it gets better mileage and it seems to be a little more quiet than it used to. people that don't listen to it all the time think I am nuts