new stihl ms261c scored piston/cylinder

So like the title Says I have a brand new 2020 chainsaw. I purchased Stihl 2 stroke oil. the orange bottle from the dealer. I use 93 Octane non-ethanol And I mix 2.6 ounces per 1 gallon for a 50:1 ratio. So I’ve used the saw maybe 4 to 6 times and I’ve cut down 2 white oak trees that are about...