Hello everyone, I'm new here so forgive mistakes. I have a question about oil, specifically what to choose for the Stihl ms291 and ms231 petrol chainsaw. So far in ms291 I have always poured "Stihl hp" (the red one) into the mix, but several friends said that "Stihl hp ultra" is much better and ms231 is new and I'm thinking about changing the oil, hence the question for you. Is this hp ultra really so good? thank you in advance for your answers, best regards 
