solo0413, Yes you can. Welcome to the forum. I prefer to use Stihl HP Ultra (silver bottle) chainsaw oil from the hardware store and prepackaged in bottles for easy mixing one gallon of fuel at a time.
I currently use it in an OS 33GT, OS 15GT and DLE 20 and have used it no problems in the past in a G23, G62, Kalt 18 and an OS GT55.
John
init4fun I am well aware the gentleman posted in the wrong forum, a common mistake. However I choose to give him a direct answer to his first question right here rather than risk making him feel unwelcome in his very first post.